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Journal articles on the topic 'Worms – Intestinal and parasitic'
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Hall, Andrew. "Intestinal parasitic worms and the growth of children." Transactions of the Royal Society of Tropical Medicine and Hygiene 87, no. 3 (May 1993): 241–42. http://dx.doi.org/10.1016/0035-9203(93)90108-3.
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Wanmi DA, Chintem DGW, Mangbon TA, and Njilmah JA. "Gastro-intestinal parasites of Hyperopisus bebe occidentalis (gunther, 1866) in river Galma at Dakace Zaria." International Journal of Science and Technology Research Archive 1, no. 1 (July 30, 2021): 016–21. http://dx.doi.org/10.53771/ijstra.2021.1.1.0016.
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Parasitic disease is considered among the limiting factors in freshwater fish production. Fish is a cheaper source of animal protein available to the people thus, the need to control parasites that affect their productivity. Three hundred and twenty (320) Hyperopisus bebe occidentalis obtained from River Galma at Dakace, Zaria between August, 2016 and February, 2017 were examined for gastro-intestinal helminths using the formal-ether concentration techniques. Results obtained showed that 124 (38.8%) fish examined were infected by the acanthocephalan Rhadinorhynchus horridus and no other helminthes were recovered. The worms recovered were mainly from the small and large intestines, with the mid-intestine accounting for the greatest number of parasites with 90.74%. There was a general increase in infestation with increase in size of fish and there was no significant difference between the infections of male and female fish.
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SHINTOKU, Y., T. KADOSAKA, E. KIMURA, H. TAKAGI, S. KONDO, and M. ITOH. "Intestinal mast cells and eosinophils in relation to Strongyloides ratti adult expulsion from the small and large intestines of rats." Parasitology 140, no. 5 (January 25, 2013): 626–31. http://dx.doi.org/10.1017/s0031182012001837.
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SUMMARYMucosal mast cells (MMC) play a crucial role in the expulsion of Strongyloides ratti adults from the small intestine of mice. We reported the large intestinal parasitism of S. ratti in rats, and there has been no report on MMC in the large intestine of the natural host. We studied kinetics of MMC, together with eosinophils, in the upper and lower small intestines, caecum and colon of infected rats. Two distinct phases of mastocytosis were revealed: one in the upper small intestine triggered by stimulation of ‘ordinary’ adults, and the other in the colon stimulated by ‘immune-resistant’ adults that started parasitizing the colon around 19 days post-infection. In all 4 intestinal sites, the MMC peaks were observed 5–7 days after the number of adult worms became the maximum and the height of MMC peaks appeared to be dependent on the number of parasitic adults, suggesting an important role played by worms themselves in the MMC buildup.
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Ayu, Sherlina Rintik Tirta, Sri Haryati, Yulia Sari, and Sutartinah Handayani. "Relationship of Personal Hygiene and Nutritional Status to Intestinal Parasitic Infection in Simo, Boyolali." Journal of Biodiversity and Biotechnology 1, no. 1 (June 30, 2021): 38. http://dx.doi.org/10.20961/jbb.v1i1.50237.
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<p>Intestinal parasitic infections are caused by protozoa, STH and non-STH worms. Immunity, which can be determined by measuring nutritional status, and personal hygiene can affect the occurrence of intestinal parasite infections. This study aims to determine the relationship between personal hygiene and nutritional status against intestinal parasite infections in elementary school students in Simo Boyolali. This type of analytic observational research with a cross sectional approach. Total sampling was taken at elementary school of Wates, Talakbroto 1, and Kedunglengkong 1 Simo, Boyolali. There were 11 students with worms infections, 16 with protozoa infections, and 4 with worms and protozoa infection. There was a relationship between washing hands before eating (p = 0.004), after eating (0.027), after defecating (p = 0.04), biting nails (p = 0.008), wearing footwear when leaving the house (p = 0.008) , removing shoes while playing during school breaks (p = 0.001), and nutritional status (p = 0.002) with intestinal parasite infection. There was no relationship between nail clipping once a week (p = 0.118) and the availability of a latrine (p = 0.416) with intestinal parasitic infections. So, there is a relationship between personal hygiene (washing hands before eating, after eating, after defecating, biting nails, wearing footwear when leaving the house, removing shoes when playing during school breaks, and nutritional status) and intestinal parasitic infections.</p><p> </p><p>Keywords<strong>:</strong> elementary school; protozoa; worms.</p>
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MARUYAMA, H., M. EL-MALKY, T. KUMAGAI, and N. OHTA. "Secreted adhesion molecules of Strongyloides venezuelensis are produced by oesophageal glands and are components of the wall of tunnels constructed by adult worms in the host intestinal mucosa." Parasitology 126, no. 2 (February 2003): 165–71. http://dx.doi.org/10.1017/s0031182002002718.
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The parasitic female of Strongyloides venezuelensis keeps invading the epithelial layer of the host intestinal mucosa. Upon invasion, it adheres to the surface of the intestinal epithelial cells with adhesion molecules secreted from the mouth. It has been demonstrated that S. venezuelensis are expelled from the intestine because mucosal mast cells inhibit the attachment of adult worms to the mucosal surface. In the present study, we generated specific antibodies against secreted adhesion molecules to investigate their function in vivo, because these molecules have been demonstrated only in vitro in spite of the importance in the infection processes. A mouse monoclonal antibody specific to S. venezuelensis adhesion molecules inhibited the attachment of adult worms to plastic dishes and the binding of adhesion molecules to rat intestinal epithelial cells. Immunohistochemical study revealed that adhesion molecules were produced by oesophageal glands and were continuously secreted in vivo to line the wall of the tunnels formed by adult worms in the intestinal mucosa. Our findings indicate that adhesion molecules play essential roles in the infection processes of S. venezuelensis in the host intestine.
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Saputra, Hari Marta, and Mahesha Rama Dwi Putra. "JENIS-JENIS PARASIT INTERNAL PADA FESES KAMBING (Capra sp.) DI PASAR KAMBING KOTA BENGKULU." Konservasi Hayati 15, no. 2 (October 10, 2019): 18–25. http://dx.doi.org/10.33369/hayati.v1i2.10949.
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Parasitic diseases that are often a problem in livestock but are often ignored by farmers are intestinal worms caused by gastrointestinal worms. This study aims to determine the types of internal parasites in goat feces (Capra sp.). The study was conducted in July- August 2018 at the UPTD Laboratory and Animal Health Clinic in Bengkulu Province. Samples were taken from Bengkulu City Goat Market, then observed using native and sedimentation methods. The results of observing samples from three types of goat feces with negative methods obtained negative results, while observing samples by sedimentation method obtained six genus of worm eggs, specifically Ascaris sp., Ostertagia sp., Oesophagostomum sp., Strongyloides sp., Schistosoma sp., dan Skrjabinema sp.
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Brosschot, T. P., K. M. Lawrence, M. H. Kennedy, R. D. FitzPatrick, B. E. Moeller, J. Han, C. Borchers, and L. A. Reynolds. "A49 CO-INFECTION WITH PARASITIC WORMS ENHANCES THE ABILITY OF SALMONELLA TO COLONIZE THE GUT LUMEN AND DEWORMING RESTORES COLONIZATION RESISTANCE TO SALMONELLA." Journal of the Canadian Association of Gastroenterology 3, Supplement_1 (February 2020): 58–59. http://dx.doi.org/10.1093/jcag/gwz047.048.
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Abstract Background Chronic infections with intestinal helminths occur primarily in world regions where infections with bacterial pathogens are also common. Research so far has shown that helminths can promote bacterial infection, however, the precise mechanisms of this are unknown. Current helminth control strategies involve mass deworming programs, and it is as yet unclear how deworming impacts susceptibility to bacterial infections in helminth-affected areas. Aims Our aims were to decipher the mechanistic details by which helminths can promote intestinal bacterial infection, and to determine how deworming affects susceptibility to intestinal colonization by bacterial pathogens. Methods Using a mouse model of enteric helminth-bacterial coinfection, we examined how the small intestinal helminth Heligmosomoides polygyrus promotes intestinal colonization by Salmonella enterica serovar Typhimurim. To study the effect of deworming of concurrent Salmonella infection, we treated our helminth-infected mice with the anthelmintic drug Strongid P both before and after Salmonella (co-) infection. To examine whether heightened Salmonella colonization during helminth infection depended on the ability of Salmonella to invade host tissue, we compared the ability of wild-type Salmonella or an invasion-deficient mutant (ΔinvA) to colonize during helminth co-infection. Results An ongoing helminth infection resulted in high levels of Salmonella in the small intestine after co-infection, however, when mice were dewormed prior to Salmonella co-infection, they were no longer susceptible to high small intestinal Salmonella burdens. In contrast, when helminth-infected mice are dewormed after Salmonella has already co-colonized, high Salmonella burdens persisted in the small intestine. Further, we found that during helminth co-infection, Salmonella primarily expands in the gut lumen rather than in the small intestinal tissue, and in line with this, a Salmonella invasion mutant was able to colonize the intestine to a similar extent to wild-type Salmonella during helminth infection. Conclusions Deworming experiments have revealed that the effects of H. polygyrus on promoting Salmonella colonization in the small intestines depend on the ongoing presence of the helminth. Deworming did not revert bacterial burdens once Salmonella had colonized, suggesting that an ongoing helminth infection reduces colonization resistance to Salmonella infection but was not required for Salmonella to persist after initial colonization by Salmonella. Further, we discovered that Salmonella expansion during helminth infection is independent of bacterial invasion of host tissue. Funding Agencies CIHR
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Morimoto, N., M. Korenaga, K. Yagyu, N. Kagei, M. Fujieda, O. Bain, H. Wakiguchi, Y. Hashiguchi, and T. Sugiura. "Morphological observations and the effects of artificial digestive fluids on the survival of Diploscapter coronata from a Japanese patient." Journal of Helminthology 80, no. 4 (December 2006): 341–48. http://dx.doi.org/10.1017/joh2006361.
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AbstractUnusual non-human parasitic nematodes and eggs were detected in the faeces of an 8-year-old Japanese female suffering from Henoch-Schönlein purpura. The worms were adult female rhabditiform nematodes measuring 325.6–441.2 μm in length and 18.3–26.5 μm in width. One pair of the labia oris was notched with many spiny projections, while the other pair was strongly curved outwards. The worms were identified using light and scanning electron microscopy as the free-living nematode Diploscapter coronata (Cobb) based on their characteristic morphology. The patient's faeces containing worms and eggs were cultured using a filter-paper culture technique and after 7 days of culture, male as well as female worms were recovered. Worm survival time and hatchability of the eggs were examined in vitro after treatment with an artificial gastric or intestinal fluid. Although adult worms survived for less than one minute, eggs hatched after treatment with artificial gastric fluid. This suggests that eggs accidentally ingested or produced by adult D. coronata could develop in the human gastro-intestinal tract. Some morphological features of male D. coronata are also described.
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Herbert, De'Broski R., Jun-Qi Yang, Simon P. Hogan, Kathryn Groschwitz, Marat Khodoun, Ariel Munitz, Tatyana Orekov, et al. "Intestinal epithelial cell secretion of RELM-β protects against gastrointestinal worm infection." Journal of Experimental Medicine 206, no. 13 (December 7, 2009): 2947–57. http://dx.doi.org/10.1084/jem.20091268.
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Th2 cells drive protective immunity against most parasitic helminths, but few mechanisms have been demonstrated that facilitate pathogen clearance. We show that IL-4 and IL-13 protect against intestinal lumen-dwelling worms primarily by inducing intestinal epithelial cells (IECs) to differentiate into goblet cells that secrete resistin-like molecule (RELM) β. RELM-β is essential for normal spontaneous expulsion and IL-4–induced expulsion of Nippostrongylus brasiliensis and Heligmosomoides polygyrus, which both live in the intestinal lumen, but it does not contribute to immunity against Trichinella spiralis, which lives within IEC. RELM-β is nontoxic for H. polygyrus in vitro but directly inhibits the ability of worms to feed on host tissues during infection. This decreases H. polygyrus adenosine triphosphate content and fecundity. Importantly, RELM-β–driven immunity does not require T or B cells, alternative macrophage activation, or increased gut permeability. Thus, we demonstrate a novel mechanism for host protection at the mucosal interface that explains how stimulation of epithelial cells by IL-4 and IL-13 contributes to protection against parasitic helminthes that dwell in the intestinal lumen.
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Kovaleva, O. V., and L. A. Lityaeva. "Features of the intestinal microbiota in children with intestinal parasitosis." CHILDREN INFECTIONS 20, no. 2 (July 8, 2021): 44–48. http://dx.doi.org/10.22627/2072-8107-2021-20-2-44-48.
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The aim of the research is to study the features of the intestinal microbiota in children with parasitic invasions.Clinical and microbiological examination of 40 children aged from 9 months to 1 0 years with functional disorders of the intestine was carried out, in 20 of whom intestinal parasitoses were detected (15 of them — ascariasis, 5 — intestinal lambliosis) — the main group. The comparison group consisted of 20 other children with functional disorders of the intestine without intestinal parasitosis.All children underwent: assessment of the course of the ante-neonatal periods, the nature of feeding and clinical symptoms of intestinal parasitosis; triple study of feces for eggs of worms and protozoa in the enrichment environment of Turdyev, coprocytogram, biochemical analysis of feces, ultrasound of internal organs. To identify the quantitative content of the main groups of normobiota, species composition and spectrum of opportunistic bacteria and viruses, the method of gas chromatography-mass spectrometry of intestinal microbial markers was used.It was found that in children with intestinal parasitosis, already at the prenatal stage of the formation of the intestinal microbiota, risk factors were recorded that negatively affect the composition of the forming microbiota, associated with functional disorders of the digestive tract from the first days of life.The degree of deficiency of normobiota, as well as the spectrum of opportunistic bacteria in children with parasitic invasions, was greater: 14 types of bacteria in combination with herpes viruses versus 9 in the comparison group. Association Clostridium spp. — Herpes virus against the background of a deficiency of bifidobacteria and lactobacilli acts as a dominant association in the relationship with intestinal parasitosis.
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Gamar, Tarig A., Hassan H. Musa, Hisham N. Altayb, Mogeeb Kabbashi, Yassen Alsayed, and Adam D. Abakar. "Prevalence of intestinal parasites among food handlers attending public health laboratories in Khartoum State, Sudan." F1000Research 7 (June 1, 2018): 687. http://dx.doi.org/10.12688/f1000research.14681.1.
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Background: Infections by intestinal pathogens especially protozoans and helminths are considered to pose a real health problem, particularly in the tropics. They cause considerable morbidity and mortality rates in developing countries. The high prevalence of these infections is closely correlated with poverty, poor environmental hygiene, and impoverished health services. This study aimed to detect prevalence and frequency of parasitic infections among food handlers in Khartoum Sudan. Methods: Three hundred and fifty Food-handlers, attending public health laboratories in Khartoum, Sudan, for an annual medical check-up, were screened for intestinal parasites by four laboratory techniques viz. direct faecal examination, formal-ether concentration, Baermann technique and agar culture method. Results: The infection rate was 23.7% by Formol-Ether Concentration technique, followed by direct saline stool preparation (7.1%). Out of 83 positive samples the infection rate among different nationalities was as follows: Sudanese 68 (81.9%), Ethiopians 13 (15.7%), Syrians 2 (2.4%) and Egyptians 0 (0%). Intestinal parasites were more prevalent among males (73; 25.1%) than female food handlers (10; 16.9%). Three protozoans, nematodes, two tap worms and one trematode worm were detected among infected population: their frequency were as follows: Entamoeba histolytica (7.4%), Entamoeba coli (6.86%), Giardia lamblia (6%), Schistosoma mansoni (1.40%), Necator americanus (1.43%), Hymenolepis nana (0.68%), Strongyloides stercoralis (0.68%), Taenia saginata (0.57%), Ascaris lumbricoides (0.57%) and Trichostrongylus species (0.29%). Conclusion: The overall prevalence of protozoan infections among food handler in Khartoum state, Sudan was 20.26% while the helminthic infections was 5.97%. Formol-ether concentration technique is better for detection of intestinal parasites than the direct faecal smear technique. Likewise, Barmann’s technique confirms detection of nematodes worms especially hookworms.
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WILKES, C. P., F. J. THOMPSON, M. P. GARDNER, S. PATERSON, and M. E. VINEY. "The effect of the host immune response on the parasitic nematode Strongyloides ratti." Parasitology 128, no. 6 (May 13, 2004): 661–69. http://dx.doi.org/10.1017/s0031182004005062.
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The host immune response has profound effects on parasitic nematode infections. Here we have investigated how a range of infection parameters are affected by host immune responses and by their suppression and enhancement. The infection parameters considered were the number of parasitic females, their size, per capita fecundity and intestinal position. We found that in immunosuppressive treatments worms persist in the gut, sometimes with a greater per capita fecundity, maintain their size and have a more anterior gut position, compared with worms from control animals. In immunization treatments there are fewer worms in the gut, sometimes with a lower per capita fecundity and they are shorter and have a more posterior gut position, compared with worms from control animals. Worms from animals immunosuppressed by corticosteroid treatment reverse their changes in size and gut position. This description of these phenomena pave the way for a molecular biological analysis of how these changes in infection parameters are brought about by the host immune response.
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Afridi, Muhammad Faisal, Arshad Khushdil, Kulsoom Farhat, Zaheer Ahmed, Hajra Ahmed, and Shabana Ali. "Prevalence of Intestinal Parasitic Infestation among Pre-school Children in Skardu, Pakistan." Pakistan Journal of Public Health 10, no. 1 (October 26, 2020): 11–15. http://dx.doi.org/10.32413/pjph.v10i1.309.
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Background: World Health Organization (WHO) reports that around 270 million pre-school children and over six hundred million school children are likely to be infested with one or more types of the intestinal worms. The helminthic infestations are indicators of the low socioeconomic status, lack of education, lack of good hygienic conditions and inaccessibility to potable water. Our study aimed to estimate prevalence of intestinal parasitic infections among 1 to 5 years old children residing in the district Skardu of Gilgit Baltistan, Pakistan. Methods: A descriptive, cross-sectional study was carried out on pre-school children of the district Skardu from August 2016 to January 2017. A sample of 300 children was obtained using non-probability convenience sampling technique. Demographical data was obtained through the structured questionnaire. The stool sample was collected and examined for intestinal parasites. The data was analysed using SPSS. Results: The prevalent intestinal helminths were found to be Ascaris Lumbricoides, Cryptosporidium , Hymenolepis Nana and Giardia with proportion of 22.33% , 14.0% , 9.3% and 8.0% respectively in our study population. 85% children of the sample belonged to low or lower middle socio-economic (SE) groups; correspondingly, increased prevalence of intestinal helminthic infestation was noted in the same SE groups. Conclusion: A high prevalence of these parasitic infections have been found in the children in Sakardu, which increases with age as the children start eating by themselves.
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Nembo, B., P. Duie, M. Garcia, P. Breton, P. Gayral, P. Porcheron, and F. Goudey-Perriere. "Levels of ecdysteroid-like material in adults of Nippostrongylus brasiliensis during the intestinal phase." Journal of Helminthology 67, no. 4 (December 1993): 305–15. http://dx.doi.org/10.1017/s0022149x00013316.
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AbstractTotal ecdysteroid-like immunoreactive material was assayed and quantified in adults of the parasitic nematode N. brasiliensis during the intestinal phase in the rat in order to detect possible physiological fluctuations in titre. Worms of the same sex isolated from one rat were pooled in order to quantify ecdysteroids using enzyme immunoassay (EIA). The concentration of ecdysteroids fluctuated during adult life according to the sex and the age of the parasite. Important differences of levels of ecdysteroid-like compounds between the two sexes of parasites were noted particularly at 128 and 168 h post-infection. The peak at 128 h, present in female, but not in male worms, corresponds to the time of egg-laying. Following HPLC-EIA analysis, the presence of ecdysone, 20-hydroxyecdysone and apolar ecdysteroid-like material was ascertained during this peak. The physiological role and the possible origin of ecdysteroids in this nematode are discussed.
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Abro, Shahnawaz, Ashfaque Ahmed Bhurgiri, Ahmed Hussain, Syed Zulfiquar Ali Shah, and Musaib Ali Khero. "PARASITIC INFESTATIONS." Professional Medical Journal 22, no. 03 (March 10, 2015): 306–11. http://dx.doi.org/10.29309/tpmj/2015.22.03.1346.
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Parasitic infections lead to burden of morbidity and mortality in developingcountries. Surgeons practicing in the tropics are familiar with the parasitic disorders. Objectives:To determine the role of surgery in parasitic infestations of Echinococcus granulosus and Ascarislumbricoides. Design: Cross sectional case series study. Period: Two years. Setting: LiaquatUniversity Hospital Hyderabad. Patients and methods: All the patients with Echinococcusgranulosus and Ascaris lumbricoides were admitted in the ward and were observed for differentmanifestations and surgical procedures aimed to cure the echinococcosis and ascariasisinfestation. The data was analyzed in SPSS 16 and the frequency and percentage wascalculated. Results: During two years study period, total sixty cases of parasitic infestations(50 cases of Echinococcus granulosis and 10 cases of Ascaris Lumbricoides) were detectedat Liaquat University Hospital Hyderabad / Jamshoro. The hydatid cysts was more common inthe age group of 30-39 years while the mean age ± SD in overall patients with Echinococcusgranulosis infestation was 38.74±7.84 whereas it was 35.87±8.64 and 40.43±6.73 in male andfemale population respectively. The Ascaris Lumbricoides was more common in the age groupof 15-20 years while the mean age ± SD in overall patients with Ascaris lumbricoides infestationwas 16.62±5.21 whereas it was 15.42±7.31 and 16.43±5.41 in male and female populationrespectively. Among 47 surgically treated cases of echinococcus, the approach used werecyst evacuation and tube drainage in 40 patients, total cystopericystectomy in 04 patients andlaparoscopically in 03 subjects accordingly. Seven (70%) cases of intestinal obstruction dueto ascariasis underwent surgical intervention like external milking of the obstructing bolus ofworms from the ileum into colon in 03 patients, intestinal resection and end to end anastomosisin 01 case and enterotomy and manual extraction of worms in 03 subjects accordingly.Conclusions: Hydatid disease and Ascaris lumbricoides may cause fatal complications andsurgical intervention has been the valuable option.
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KAYGORODOVA, IRINA A., and ELENA V. DZYUBA. "New information on the distribution pattern of Acanthobdella peledina (Annelida, Acanthobdellida) in Eastern Siberia." Zootaxa 4399, no. 1 (March 20, 2018): 123. http://dx.doi.org/10.11646/zootaxa.4399.1.8.
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The Acanthobdellida is a group of annelid parasites of fish, which are restricted to subarctic parts of the Northern Hemisphere. These ancient worms arouse the interest of the scientific world due to their mosaic combination of (1) primitive oligochaetous characters (e.g. the presence of setae on the very anterior segments, a lateral nerve system and a metameric coelomic cavity around the intestinal canal) and (2) evolutionarily advanced hirudinean ecological and morphological features (e.g. suckers and parasitic lifestyle), attesting to their intermediate role between Oligochaeta and Euhirudinea (i.e. leeches with setae).
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Singh Khadka, Kamal, Hari Prasad Kaphle, Krishna Gurung, Yogendra Shah, and Manoj Sigdel. "Study of Intestinal Parasitosis among School Going Children in Pokhara, Nepal." Journal of Health and Allied Sciences 3, no. 1 (November 24, 2019): 47–50. http://dx.doi.org/10.37107/jhas.54.
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The study was carried out in order to estimate the prevalence of intestinal parasitosis in school-going children in schools located in Pokhara, Nepal from November 2011 to January 2012. A total number of 100 stool samples were collected from children of ages 3 to 15 years. A questionnaire including the factors predisposing to parasitosis was filled up and parasitic examination was carried out by direct wet mount examination and concentration method using standard formal ether concentration technique. The prevalence rate was found to be 15%. Prevalence of parasitic infection was higher in girls (16%) than in boys (14%) and age group 8-12 years were found to be more suffering (17.3%) than other age groups. The occurrence of parasitic infection in symptomatic children was found to be 40% and 10% in asymptomatic children. The symptoms were found statistically significant with infestation of parasites. Intestinal infection was highest in Dalit students (20%) compared to other caste students. Prevalence of parasitic infection in other caste was 15% in Brahman, 9.5% in Newar and 9% in Chhetri. Among 15 positive cases 5 types of parasites were detected. The results showed Giardia lamblia to be the most common parasite. Occurrence of other intestinal parasites was Entamoeba histolytica (26.6%), Ascaris lumbricoides (26.6%), Trichuris trichura (6.6%) and Hook worm (6.6%). The study concluded that intestinal parasitosis is still public health problem among school going children of Pokhara valley especially among Dalit students.
Key words: Intestinal parasitosis, Formal ether concentration, Children, Pokhara, Nepal
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Lochnit, Günter, Julia Grabitzki, Björn Henkel, Nektarios Tavernarakis, and Rudolf Geyer. "First identification of a phosphorylcholine-substituted protein from Caenorhabditis elegans: isolation and characterization of the aspartyl protease ASP-6." Biological Chemistry 387, no. 10/11 (October 1, 2006): 1487–93. http://dx.doi.org/10.1515/bc.2006.186.
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AbstractCaenorhabditis elegansis a widely accepted model system for parasitic nematodes, drug screening and developmental studies. Similar to parasitic worms,C. elegansexpresses glycosphingolipids and glycoproteins carrying, in part, phosphorylcholine (PCho) substitutions, which might play important roles in nematode development, fertility and, at least in the case of parasites, survival within the host. With the exception of a major secretory/excretory product fromAcanthocheilonema viteae(ES-62), no protein carrying this epitope has been studied in detail yet. Here we report on the identification, characterization and localization of the aspartyl protease ASP-6 ofC. elegans, which is excreted by the nematode in aPCho-substituted form. Within the worm, most prominent expression of the protein is observed in the intestine, while muscle and epithelial cells expressasp-6to a lesser extent. In animals harboring an ASP-6::GFP fusion protein, diffuse fluorescence throughout the body cavity of adult worms indicates that the chimeric protein is secreted.
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Tiwari, Bishnu Raj, Ranju Chaudhary, Nabaraj Adhikari, Sailesh Kumar Jayaswal, Thakur Prasad Poudel, and Komal Raj Rijal. "Prevalence of Intestinal Parasitic Infections among School Children of Dadeldhura District, Nepal." Journal of Health and Allied Sciences 3, no. 1 (November 21, 2019): 14–16. http://dx.doi.org/10.37107/jhas.44.
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Intestinal parasitic infestations are a common finding in the developing world, however, the patterns of parasitic distribution and rates are different elsewhere. The prevalence of intestinal parasitic infestation and chemical analysis of stool sample of the school children of age group 4-12 years in Dadeldhura district, far western region of Nepal. Out of 530 stool samples, 165 (31.13%) were found to be intestinal parasites positive. Among the total parasites, Hymenolepsis nana (46.56%) and Giardia lamblia (7.47%) were found in high prevalence as helmiths and protozoa respectively. Among the total stool samples 159 (30%) showed positive occult blood test. The prevalence of parasitic infection was found high in the children of age group 4-6 years (38.18%) than others though the result was not significant statistically (P>0.05). Highest prevalence of parasites was found in those not following the hygienic conditions (36.17%) than those following (18.83%). Similarly, high proportion of the parasites were found in children having gastrointestinal symptoms (49.23%) than in children without the gastrointestinal symptoms (13.70%) though the result was not significant statistically (P>0.05). The study showed the children using the water directly from the source had higher prevalence of parasites (32.13%) than those using treated water (14.28%). This study presents the high prevalence of stool parasites in school going children of Dadeldhura district.
Key words: Parasitic infection, School children, Stool samples, Dadeldhura, Nepal.
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Landers, Stephen C. "Light and Electron Microscopic Examination of the Parasitic Dinoflagellate Haplozoon." Microscopy and Microanalysis 6, S2 (August 2000): 884–85. http://dx.doi.org/10.1017/s1431927600036916.
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The parasitic dinoflagellate Haplozoon is found in the intestine of marine polychaetes. It is composed of a chain of cells that hang from the intestinal wall into the lumen, and releases daughter cells from the posterior end of the chain which leave the host and reinfect other polychaetes. Few studies exist in the recent literature regarding Haplozoon and it has not been reported from the Gulf Coast of the United States. This study reports the genus Haplozoon from the maldanid polychaete Axiothella mucosa in St. Andrew Bay, Florida, and examines the structure of the organism by light and electron microscopy.Axiothella mucosa was collected in St. Andrew Bay, Florida and maintained in seawater at the Troy State University campus. Haplozoon spp. was prepared for whole mounts by smearing minced setigers of the worms onto a slide with a drop of seawater.
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Chandi, Dhruba Hari, and Sucheta J. Lakhani. "Intestinal Parasite Infestation in HIV Infected Patients in Tertiary Care Center." Journal of Pure and Applied Microbiology 15, no. 3 (August 23, 2021): 1602–7. http://dx.doi.org/10.22207/jpam.15.3.56.
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Every year, the number of people living with HIV rises as a consequence of advanced infections and the positive effects of highly active antiretroviral therapy (HAART). Gastrointestinal involvement is common, with 90% of patients seeking treatment for gastrointestinal problems as their HIV infection progresses. Nonetheless, identifying and characterization of infectious agents is important for patient management by excluding a clinical diagnosis and determining appropriate treatment, as well as determining public healthcare policy for true pathogen prevalence and yielding epidemiological risk factors for specific infections. The aim of this study is to evaluate the prevalence of symptomatic or asymptomatic intestinal parasitic infection among HIV or AIDS patients. For this study with 80 HIV seropositive patients being recruited from various wards and the Integrated Counseling and Testing Center (ICTC) affiliated to the microbiology department. Patients with acute and chronic diarrhea with abdominal disorder were taken as symptomatic whereas patients without these clinical complaints and who came for routine investigations were taken as asymptomatic. Firstly stool samples were analyzed by macroscopically for the presence of mucus, blood, larvae, segments of tapeworm and adult worms. The consistencies of stool were also recorded such as formed, watery or soft or loose with odor and color. It was examined microscopically after macroscopically for protozoan cysts and trophozoites, helminthic ova and larvae, as wet mount preparation by saline and iodine preparation as well as formal ether concentrated. For the detection of intestinal coccidian parasites, smears were prepared from stool samples and a modified Ziel-Nelseen (MZN) stain was also performed. Stool samples with the detection of parasites were informed for treatment. The prevalence of intestinal parasite was 23.75% with asymptomatic and symptomatic groups having a prevalence of 16.98% and 37.04% respectively. Out of total patients, 56.25% were male and 43.75% were female. Among the male patients, 11 (13.75%) were positive for an intestinal parasitic infection and 8 (10%) were positive among females. The age distribution data revealed that the age group 21-40 years old had the highest number of intestinal parasites, followed by 41-60, 61-80, and 0-20 years old. The most intestinal parasites were found in the young and middle-aged patients, according to this study. Different parasites were identified as Entamoeba histolytica, Taenia species, Ascaris lumbricoides, Cryptosporidium parvum and Isospora with one protozoan, two coccidian parasites and two helminthes. The most common parasite was Taenia species 6 (7.5%) followed by Entamoeba histolytica 5 (6.3%) and Cryptosporidium parvum 5 (6.3%). Intestinal parasitic infection is not uncommon in HIV seropositive patients. This study underscores the need for early diagnosis and treatment of these intestinal parasites in both symptomatic and asymptomatic HIV patients.
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WAKELIN, D., S. E. FARIAS, and J. E. BRADLEY. "Variation and immunity to intestinal worms." Parasitology 125, no. 7 (October 2002): S39—S50. http://dx.doi.org/10.1017/s0031182002001440.
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Genetically determined variation in host capacity to express resistance to a given parasite plays a major role in determining the outcome of infection. It can be assumed that the same is true of variation in parasites, but very much less is known of its influence on the host–parasite relationship. Phenotypic and genotypic variation within species of intestinal worms is now well documented, detailed studies having been made of parasites such asAscarisin humans and trichostrongyles in domestic animals. However, the extent to which this variation affects the course of infection or the host immune response in these hosts is limited. Of the nematodes used as experimental models in laboratory rodents, detailed data on phenotypic or genotypic variation are limited toStrongyloidesandTrichinella. Parasite variation is known to be subject to host-mediated selection, the emergence of anthelmintic resistance being a good example. Repeated passage has been used to select lines of parasite that survive in abnormal hosts or which show adaptation to host immunity. Experimental studies withTrichinellagenotypes in mice have demonstrated the extent to which parasite variation influences the nature and degree of the host's immune and inflammatory responses, the complex interplay between immunogenicity and pathogenicity influencing both partners in the relationship. Recent studies with isolates ofTrichuris murishave shown how parasite variation influences the capacity of mice to express the T helper cell responses necessary for resistance. Molecular differences betweenT. murisisolates have been shown in their excreted/secreted products as well as at the level of their DNA. Knowledge of the functional consequences of parasite variation will add to our understanding of host-parasite evolution as well as providing a rational basis for predicting the outcome of controls strategies that rest on the improvement of host resistance through vaccination or selective breeding.
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Mijošek, Tatjana, Vlatka Filipović Marijić, Zrinka Dragun, Dušica Ivanković, Nesrete Krasnići, Zuzana Redžović, Marina Veseli, et al. "Thallium accumulation in different organisms from karst and lowland rivers of Croatia under wastewater impact." Environmental Chemistry 17, no. 2 (2020): 201. http://dx.doi.org/10.1071/en19165.
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Environmental contextDespite thallium’s high toxicity, water solubility and bioaccumulation tendency, its ecotoxicological relevance is largely unknown. We investigated thallium concentrations in fish, amphipods and parasitic worms from a karst freshwater ecosystem, and estimated total and cytosolic thallium concentrations in intestine of fish from the karst and lowland rivers impacted by wastewater inflow. The study provides the first data on dietary thallium accumulation in the intestine of freshwater fishes. AbstractThe aim of the present research was to investigate the bioaccumulation of thallium (Tl), a technology-critical element, in fish intestine and muscle, gammarids and the fish intestinal parasites, acanthocephalans, and to evaluate their potential as indicators of metal exposure in aquatic environments. Moreover, total and cytosolic (metabolically available and potentially toxic fraction) Tl concentrations were measured and compared between the intestines of brown trout (Salmo trutta Linnaeus, 1758) from the karst Krka River and Prussian carp (Carassius gibelio Bloch, 1782) from the lowland Ilova River. Since there is a scarcity of information on subcellular metal partitioning in the fish intestine, the results of Tl concentrations in acid digested intestinal tissue, homogenate and cytosol represent preliminary data on Tl diet-borne uptake in salmonid and cyprinid fish. In both rivers, samplings were performed upstream (reference site) and downstream (contaminated site) of the wastewater impact in autumn and spring. Total Tl concentrations were much higher in brown trout than Prussian carp, and higher proportions of cytosolic Tl concentrations were observed in the intestinal tissue of brown trout (45–71%) compared with that of Prussian carp (32–47%). Therefore, both indicators showed species- and site-specific differences. Considering different bioindicator organisms, the most effective Tl accumulation was evident in acanthocephalans compared with the fish tissues and gammarids, which confirmed the potential of fish parasites as bioindicators of metal exposure. Trends of spatial and temporal Tl variability were mostly comparable in all indicator organisms and for total and cytosolic Tl concentrations in the intestine of salmonid and cyprinid fish species, which confirmed their application as useful biological tools in metal exposure assessment.
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Mentz, Márcia B., Eliane Dallegrave, and Carlos Graeff-Teixeira. "Susceptibility and morbidity between male and female Swiss mice infected with Angiostrongylus costaricensis: Susceptibilidade e morbidade entre camundongos Swiss machos e fêmeas infectados com Angiostrongylus costaricensis." Revista do Instituto de Medicina Tropical de São Paulo 52, no. 5 (October 2010): 267–68. http://dx.doi.org/10.1590/s0036-46652010000500008.
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The gender of vertebrate hosts may affect the outcome of parasitic infections. An experimental murine infection with Angiostrongylus costaricensis was followed with determinations of body weight, fecal larval elimination, number and length of adult worms, number of macroscopic intestinal lesions, and mortality. Groups of male and female Swiss mice were infected with 10 3rd-stage A. costaricensis larvae per animal. The results indicate there are no significant differences related to gender of the host, except for higher length of worms developed in male mice.
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Maru Wassie Yenene and Abayneh Unasho Gandile. "Prevalence of the common intestinal parasitic infections and predisposing factors among the asymptomatic primary school children in Finoteselam town, West Gojam Zone, Amhara region (Ethiopia)." World Journal of Advanced Research and Reviews 8, no. 2 (November 30, 2020): 173–88. http://dx.doi.org/10.30574/wjarr.2020.8.2.0210.
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Background: Intestinal parasitic infections (IPIs) have been still quite common in developing countries including Ethiopia, particularly in children with low socio-economic and poor living conditions. Previous studies in Ethiopia have shown high burden of intestinal parasitic infections among the primary school children. The effective prevention and control of parasitic infections require research work based on the identification of intestinal parasites including associated predisposing factors. Objective: The aim of the present study was to investigate the prevalence of common intestinal parasitic infections and predisposing factors among the asymptomatic primary school children. Methods: A school based cross- sectional study was conducted from September, 2019- January, 2020 and a total of 422 asymptomatic primary school children were involved in the study. Specimens of the stool samples were examined using the standard parasite and ova method. Direct microscopy using saline and iodine wet mount preparation was used to examine the presence of eggs and larvae of helminthes and trophozoites and cysts of protozoan parasites and formalin ether concentration method was used for quality assurance. Structured questionnaires were also used to collect quantitative data on socio-demographic characteristics and predisposing factors. Analysis of the data was made manually using the thematic framework method including descriptive statistics. Results: Among the 422 students (aged 5-14 years) participated in the study, 245(58%) were positive for one or more intestinal parasites. Of the total infected participants, 192(45.5%) were single infections and 53(12.6%) were double infections identified. Seven types of intestinal parasitic infections were identified in the present study. The most prevalent parasite was Giardia lamblia 95(22.5%) followed by hook worm 58(13.7%). Age groups 5-9 years old were more infected, 173 (70.6%) than age groups 10-14 years old 72(29.4%). This result also showed parasitic infections were associated with predisposing factors related to infectious cycles. Concluding Remarks and Recommendations: The present study revealed that there was a high prevalence of intestinal parasitic infection among students in the targeted primary schools. Therefore, all stakeholders should give attention to raise awareness about the prevention and control mechanisms of intestinal parasitic infections. Moreover, the health services of the local government should develop a habit of mass public health education and deworming intervention to improve the level of parasitic infection and environmental hygiene in the study area.
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Fuse, M., K. G. Davey, and R. I. Sommerville. "Osmoregulation in the parasitic nematode Pseudoterranova decipiens." Journal of Experimental Biology 175, no. 1 (February 1, 1993): 127–42. http://dx.doi.org/10.1242/jeb.175.1.127.
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When subjected to hyper- or hypo-osmotic stress at 5 degrees C for 24 h, third-stage larvae of the parasitic nematode Pseudoterranova decipiens do not exhibit changes in mass or in the osmotic pressure of the pseudocoelomic fluid. Immersion in solutions containing 3H2O demonstrates that exchange with the water in the pseudocoelomic fluid is substantially complete within 24 h. Sacs composed of cylinders of body wall without the intestine and pseudocoelomic fluid do not gain weight when immersed for 24 h in hypotonic medium. Metabolic poisons abolish the ability of whole worms and sacs to maintain their weight when immersed in hypotonic media. These observations support the conclusion that the nematode is capable of at least short-term osmoregulation and that the site of osmoregulation is the body wall. The observations that more fluid is passed from the anus in some hypo-osmotically stressed worms and that worms ligatured at the tail exhibit a small increase in mass when exposed to hypo-osmotic conditions may indicate that the intestine plays a minor and subsidiary role in osmoregulation.
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Shah, Jamil, and Abul Shahidullah. "Ascaris lumbricoides: A Startling Discovery during Screening Colonoscopy." Case Reports in Gastroenterology 12, no. 2 (May 31, 2018): 224–29. http://dx.doi.org/10.1159/000489486.
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Intestinal parasitic infections are a major public health issue across the world and particularly in rural and urban areas of tropical and subtropical countries. Those at increased risk include inhabitants of poor and disadvantaged regions, which are more likely to have inadequate environmental sanitation, insufficient water supply, greater contact rates with reservoirs of infection, limited health literacy, and socioeconomic disparities. Of the intestinal nematodes (roundworms) that parasitize the human gastrointestinal tract, Ascaris lumbricoides is the largest in terms of size. It causes ascariasis, a “neglected tropical disease,” or NTD, that is among the most common helminthic human infections worldwide with an estimated 800 million to 1.2 billion people infected. It causes more than 60,000 deaths annually. However, in more than 85% of cases, infections do not result in symptoms – especially in individuals infected with a small number of worms. Thus, many individuals with intestinal ascariasis remain undiagnosed for years until either they experience symptoms and seek medical attention, the macroscopic adult worms are passed with the stool, or the adult worms are incidentally discovered during routine endoscopic procedures. Here, we present an interesting case of an elderly Bangladeshi man with seemingly innocuous complaints of intermittent mild abdominal symptoms and no recent travel history, who was discovered to have intestinal ascariasis during a screening colonoscopy.
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Scalfone, Lisa K., Hendrik J. Nel, Lucille F. Gagliardo, Jody L. Cameron, Shaikha Al-Shokri, Cynthia A. Leifer, Padraic G. Fallon, and Judith A. Appleton. "Participation of MyD88 and Interleukin-33 as Innate Drivers of Th2 Immunity to Trichinella spiralis." Infection and Immunity 81, no. 4 (February 12, 2013): 1354–63. http://dx.doi.org/10.1128/iai.01307-12.
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ABSTRACTTrichinella spiralisis a highly destructive parasitic nematode that invades and destroys intestinal epithelial cells, injures many different tissues during its migratory phase, and occupies and transforms myotubes during the final phase of its life cycle. We set out to investigate the role in immunity of innate receptors for potential pathogen- or danger-associated molecular patterns (PAMPs or DAMPs). Focusing on the MyD88-dependent receptors, which include Toll-like receptors (TLRs) and interleukin-1 (IL-1) family members, we found that MyD88-deficient mice expelled worms normally, while TLR2/4-deficient mice showed accelerated worm expulsion, suggesting that MyD88 was active in signaling pathways for more than one receptor during intestinal immunity. A direct role for PAMPs in TLR activation was not supported in a transactivation assay involving a panel of murine and human TLRs. Mice deficient in the IL-1 family receptor for the DAMP, IL-33 (called ST2), displayed reduced intestinal Th2 responses and impaired mast cell activation. IL-33 was constitutively expressed in intestinal epithelial cells, where it became concentrated in nuclei within 2 days of infection. Nuclear localization was an innate response to infection that occurred in intestinal regions where worms were actively migrating. Th2 responses were also compromised in the lymph nodes draining the skeletal muscles of ST2-deficient mice, and this correlated with increased larval burdens in muscle. Our results support a mechanism in which the immune system recognizes and responds to tissue injury in a way that promotes Th2 responses.
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Daly, Christine M., Graham Mayrhofer, and Lindsay A. Dent. "Trapping and Immobilization ofNippostrongylus brasiliensis Larvae at the Site of Inoculation in Primary Infections of Interleukin-5 Transgenic Mice." Infection and Immunity 67, no. 10 (October 1, 1999): 5315–23. http://dx.doi.org/10.1128/iai.67.10.5315-5323.1999.
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ABSTRACT Interleukin-5 (IL-5) transgenic mice are highly resistant to primary infections with the intestinal nematode Nippostrongylus brasiliensis; few parasites are found in the intestines of infected animals, and egg production is minimal. While adult worms may be damaged in the intestine, larval migration, development, and viability may also be impaired in other tissues. This study addresses the migration of N. brasiliensis larvae through the skin and lungs and associated cellular responses in primary infections of IL-5 transgenic mice. Although some larvae may have been trapped and killed in the lungs of IL-5 transgenic mice, most apparently failed to reach this site. Two or more hours after infection of IL-5 transgenic mice, eosinophils were a major component of the cellular infiltrate at the subcutaneous site of injection, and localized eosinophil degranulation was extensive. Seventy-five to ninety-five percent of the larvae injected into subcutaneous air pouches in IL-5 transgenic mice were retained there for at least 24 h. In contrast, in nontransgenic mice, less than 20% of larvae could be recovered from the skin 2 or more h postinjection, and eosinophil activity was modest at all times. The data strongly suggest that eosinophils can restrict the movement of N. brasiliensis larvae in the first few hours of a primary infection and that this has profound effects on later stages of parasite development. Preexisting eosinophilia, due either to allergy or to infection with tissue-invasive helminth species, may therefore confer some degree of immediate and nonspecific resistance in primary infections with parasitic worms.
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Smith, Allen D., Lumei Cheung, Ethiopia Beshah, Terez Shea-Donohue, and Joseph F. Urban. "Selenium Status Alters the Immune Response and Expulsion of Adult Heligmosomoides bakeri Worms in Mice." Infection and Immunity 81, no. 7 (May 6, 2013): 2546–53. http://dx.doi.org/10.1128/iai.01047-12.
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ABSTRACTHeligmosomoides bakeriis a nematode with parasitic development exclusively in the small intestine of infected mice that induces a potent STAT6-dependent Th2 immune response. We previously demonstrated that host protective expulsion of adultH. bakeriworms from a challenge infection was delayed in selenium (Se)-deficient mice. In order to explore mechanisms associated with the delayed expulsion, 3-week-old female BALB/c mice were placed on a torula yeast-based diet with or without 0.2 ppm Se, and after 5 weeks, they were inoculated withH. bakeriinfective third-stage larvae (L3s). Two weeks after inoculation, the mice were treated with an anthelmintic and then rested, reinoculated with L3s, and evaluated at various times after reinoculation. Analysis of gene expression in parasite-induced cysts and surrounding tissue isolated from the intestine of infected mice showed that the local-tissue Th2 response was decreased in Se-deficient mice compared to that in Se-adequate mice. In addition, adult worms recovered from Se-deficient mice had higher ATP levels than worms from Se-adequate mice, indicating greater metabolic activity in the face of a suboptimal Se-dependent local immune response. Notably, the process of worm expulsion was restored within 2 to 4 days after feeding a Se-adequate diet to Se-deficient mice. Expulsion was associated with an increased local expression of Th2-associated genes in the small intestine, intestinal glutathione peroxidase activity, secreted Relm-β protein, anti-H. bakeriIgG1 production, and reduced worm fecundity and ATP-dependent metabolic activity.
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Fuse, M., K. G. Davey, and R. I. Sommerville. "Water compartments and osmoregulation in the parasitic nematode Pseudoterranova decipiens." Journal of Experimental Biology 175, no. 1 (February 1, 1993): 143–52. http://dx.doi.org/10.1242/jeb.175.1.143.
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A study of the time course of penetration of 3H2O into whole worms suggests that worms immersed in a hypo-osmotic environment (15% artificial sea water) reach full exchange equilibrium more slowly than worms in an iso-osmotic environment (40% artificial sea water). The apparent water content, determined by dry mass, matches that determined by 3H2O exchange when worms are immersed for 24 h in 40% artificial sea water (ASW), but the water content measured by 3H2O exchange is lower when worms are kept in a hypo-osmotic environment for 24 h. These differences disappear after 48 h. No such differences are apparent when sacs, consisting of cylinders of body wall lacking their intestines and pseudocoelomic fluid and closed at both ends by ligatures, are immersed in either 40% or 15% ASW for 24 h. The placing of ligatures at the head, but not at the tail, results in a failure of worms immersed in 40% ASW or 15% ASW containing 3H2O to achieve full exchange equilibrium within 24 h. These results suggest that although worms immersed in an iso-osmotic environment drink, those immersed in a hypo-osmotic environment do not, a conclusion supported by studies involving the addition of [14C]inulin to the medium. The application of ligatures to the head and tail of worms immersed in 40% ASW results in a slower penetration of 3H2O into the pseudocoelomic fluid, whereas similar ligatures do not further retard the penetration in worms exposed to 15% ASW. The results are consistent with a model which sees the pseudocoelomic fluid as consisting of two compartments containing water, one of which exchanges more slowly than the other.
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NEJSUM, P., A. ROEPSTORFF, T. J. C. ANDERSON, C. JØRGENSEN, M. FREDHOLM, and S. M. THAMSBORG. "The dynamics of genetically markedAscaris suuminfections in pigs." Parasitology 136, no. 2 (December 18, 2008): 193–201. http://dx.doi.org/10.1017/s0031182008005349.
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SUMMARYThe genotypes of both host and parasite may influence the outcome of parasitic infections, but few attempts have been made to quantify the effect of parasite genotype on macroparasite infections of socio-economic importance. We examined variation in particular traits during the infection in pigs with the parasitic nematodeAscaris suum. We infected 26 pigs with mixtures of equal proportions of embryonated eggs from 4 single female worms each with a unique mtDNA haplotype – the eggs from each female worm were a mixture of siblings and half-siblings. Pigs were necropsied on days 14, 17 and 28 following inoculation, which corresponded to time-points before, during and after the main immune responses against the nematode. A total of approximately 11 000 worms were recovered at necropsy. The location in the small intestine was recorded for all worms and the length and mtDNA haplotype were determined for about 4200 individual worms. There were significant differences in the distribution and abundance of the 4 individual haplotypes among individual pigs demonstrating strong interactions between parasite and host. We found significant differences in the abundance and position in the small intestine as well as the size of worms among haplotypes. We conclude that both parasite and host effects as well as the interplay between them play important roles in determining the characteristics and outcome of infection.
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Ahmed, Mejbah Uddin, Deb Prosad Paul, Md Alamgir Hossain, Mohammad Quamrul Hasan, and Md Khalilur Rahman. "Fasciolopsis buski Infection in a 50-Year-Old Female." Journal of Enam Medical College 4, no. 2 (July 24, 2014): 123–25. http://dx.doi.org/10.3329/jemc.v4i2.19681.
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Fasciolopsiasis is a disease caused by the largest food-borne intestinal trematode known as Fasciolopsis buski. Here we report a case of a 50-year-old female who presented with upper abdominal pain and vomiting for one month. She was previously diagnosed as a case of choledocholithiasis. Endoscopic retrograde cholangio-pancreatography (ERCP) revealed stones along with two leaf-shaped worms which were removed from the duodenum of the patient. The worms were identified as F. buski by its unique morphology. Awareness regarding this parasitic infestation, especially in the rural area, should gain attention while formulating strategies to prevent and manage such infestation. DOI: http://dx.doi.org/10.3329/jemc.v4i2.19681 J Enam Med Col 2014; 4(2): 123-125
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Holland, Celia V., D. W. T. Crompton, D. L. Taren, M. C. Nesheim, Diva Sanjur, Irma Barbeau, and Katharine Tucker. "Ascaris lumbricoides infection in pre-school children from Chiriqui Province, Panama." Parasitology 95, no. 3 (December 1987): 615–22. http://dx.doi.org/10.1017/s0031182000058030.
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SUMMARYAn epidemiological survey of intestinal parasitic infections was conducted in a sample of 203 children aged 3–5 years from a semi-urban and a rural community in Chiriqui, Panama, in 1983–4. On the basis of stool examinations, the prevalences of Ascaris lumbricoides, Trichuris trichiura, hookworm, Giardia intestinalis, Entamoeba spp. and Strongyloides stercoralis were found to be 27, 34, 14, 15, 5 and 4% respectively. The results from children from the two communities were compared. Polyparasitism occurred significantly more often in rural than semi-urban children. Following anthelmintic treatment with levamisole, the numbers of A. lumbricoides passed/child were recorded and the frequency distribution of the parasite was observed to be highly aggregated with a variance to mean ratio of 10·2. For A. lumbricoides, relationships between worm burden, worm biomass and egg production were investigated. In the data analysis, an attempt was made to explore the influence of numbers of male worms on egg production. The results are compared with those obtained during other recent studies on the epidemiology of A. lumbricoides infection in other countries.
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STEPHENSON, L. S., M. C. LATHAM, and E. A. OTTESEN. "Malnutrition and parasitic helminth infections." Parasitology 121, S1 (October 2000): S23—S38. http://dx.doi.org/10.1017/s0031182000006491.
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The Global Burden of Disease caused by the 3 major intestinal nematodes is an estimated 22·1million disability-adjusted life-years (DALYs) lost for hookworm, 10·5million for Ascaris lumbricoides, 6·4million for Trichuris trichiura, and 39·0million for the three infections combined (as compared with malaria at 35·7million) (World Bank, 1993; Chan et al. 1994); these figures illustrate why some scarce health care resources must be used for their control. Strongyloides stercoralis is the fourth most important intestinal worm infection; its nutritional implications are discussed, and the fact that its geographic distribution needs further study is emphasized. Mechanisms underlying the malnutrition induced by intestinal helminths are described. Anorexia, which can decrease intake of all nutrients in tropical populations on marginal diets, is likely to be the most important in terms of magnitude and the probable major mechanism by which intestinal nematodes inhibit growth and development. We present a revised and expanded conceptual framework for how parasites cause/aggravate malnutrition and retard development in endemic areas. Specific negative effects that a wide variety of parasites may have on gastrointestinal physiology are presented. The synergism between Trichuris and Campylobacter, intestinal inflammation and growth failure, and new studies showing that hookworm inhibits growth and promotes anaemia in preschool (as well as school-age) children are presented. We conclude by presenting rationales and evidence to justify ensuring the widest possible coverage for preschool-age children and girls and women of childbearing age in intestinal parasite control programmes, in order to prevent morbidity and mortality in general and specifically to help decrease the vicious intergenerational cycle of growth failure (of low-birth-weight/intrauterine growth retardation and stunting) that entraps infants, children and girls and women of reproductive age in developing areas.
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Trasia, Reqgi First. "Covid-19 dan Koinfeksi Penyakit Parasit." Medica Hospitalia : Journal of Clinical Medicine 7, no. 1A (August 28, 2020): 298–303. http://dx.doi.org/10.36408/mhjcm.v7i1a.471.
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LATAR BELAKANG: Kondisi pandemi, kasus Covid-19 semakin meningkat, manifestasi klinis seperti demam, batuk, diare, muntah, sakit kepala, mialgia dan kelelahan, mungkin sulit untuk membedakan COVID-19 dari spektrum penyakit dengan manifestasi serupa, seperti malaria dan cacingan, terutama di daerah endemik. Di Indonesia belum ada artikel yang membahas Covid-19 dengan koinfeksi malaria dan cacing. TUJUAN: Tujuan penulisan ini adalah menelaah dampak klinis infeksi Covid-19 dengan komorbid infeksi parasit yaitu malaria dan kecacingan. METODE: Penelusuran kepustakaan 154 jurnal, terdapat 4 jurnal yang relevan. DISKUSI: Manifestasi klinis malaria yang parah terjadi karena respon proinflamasi yang meningkat, hal yang sama terjadi dalam banyak kasus COVID-19. Koinfeksi Malaria dan COVID-19 dapat menyebabkan respons pro-inflamasi yang berlebihan, manifestasi klinis lebih parah dan prognosis buruk. Berdasarkan imunopatogenitas dari infeksi cacing di daerah endemis, dikhawatirkan hal tersebut akan meningkatkan keparahan gejala Covid-19 pada pasien dengan koinfeksi cacing. KESIMPULAN: Pada kasus Covid-19 yang diikuti dengan koinfeksi malaria menunjukkan keparahan manifestasi klinis akibat peningkatan respon inflamasi. Diduga bahwa respon imun hospes terhadap cacing akan memberikan dampak klinis yang lebih berat pada kasus Covid-19.
Kata kunci: Covid-19, koinfeksi, malaria, cacingan, penyakit parasit
BACKGROUND: The condition of the Covid-19 pandemic where the number of cases is increasing. Clinical manifestations such as fever, cough, diarrhea, vomiting, headache, myalgia and fatigue, it may be difficult to distinguish COVID-19 from the spectrum of diseases with similar manifestations, such as malaria and intestinal worms, especially in endemic areas. Indonesia there are no articles discussing Covid-19 with malaria and worm coinfection. OBJECTIVE: The purpose this article is to review the clinical impact of Covid-19 infection with comorbid parasitic infections, in this case malaria and worms. METHOD: Search the literature of 154 journals, there are 4 journals that are relevant DISCUSSION: The severe manifestations of malaria occur because of an increased proinflammatory response, the same thing happens in many cases of COVID-19. Malaria coinfection and COVID-19 can then cause excessive pro-inflammatory responses, severe manifestations and a poor prognosis. In addition, based on immunopathogenicity from worm infections in endemic areas, it is feared that this will increase the severity of Covid-19 symptoms in patients with worm co-infection. CONCLUSION: In the case of Covid-19 followed by co-infection with malaria, it shows the severity of clinical manifestations due to increased inflammatory response. Tobe assumed that the host's immune response to worms will have a more severe clinical impact in the Covid-19 case.
Keywords: Covid-19, coinfection, malaria, intestinal worms, parasitic diseases
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Rodrigues, R. R., S. M. Gennari, J. L. Guerra, M. B. Contieri, A. L. Abdalla, and D. M. S. S. Vitti. "Histopathological changes during experimental infections of calves with Cooperia punctata." Journal of Helminthology 78, no. 2 (June 2004): 167–71. http://dx.doi.org/10.1079/joh2003217.
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AbstractEleven male two-month-old Holstein calves were used to determine the pathological changes induced by a Cooperia punctata infection. After weaning, ten calves received a single oral dose of 45,000 C. punctata infective larvae. One calf remained as a non-infected control. Groups of two calves were killed on days 7, 14, 21, 28 and 35 post-infection (p.i.) for determination of worm burdens and histopathological evaluation. The small intestine was sub-divided into three sections of approximately equal length, and representative samples of mucosa were fixed in 10% formalin, cut, and stained with haematoxylin-eosin. Samples of intestinal contents and mucosal digests were taken and fixed in 10% formalin for an estimation of total worm burdens. An increase in the number of adult parasites and a decrease in the number of larvae were observed with time (P<0.001). A higher concentration of worms was found in the first segment of the small intestine during the five weeks of observation. Histology showed larvae in the intestinal mucosa on day 7 p.i., with a discrete increase in the cellular response. Adult worms and a marked cellular infiltrate with eosinophils and neutrophils were present on day 21 p.i., and these persisted until day 35 p.i. Microcysts resulting from worm destruction were observed from day 21 p.i.
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Panda, Sujogya Kumar, and Walter Luyten. "Antiparasitic activity in Asteraceae with special attention to ethnobotanical use by the tribes of Odisha, India." Parasite 25 (2018): 10. http://dx.doi.org/10.1051/parasite/2018008.
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The purpose of this review is to survey the antiparasitic plants of the Asteraceae family and their applicability in the treatment of parasites. This review is divided into three major parts: (a) literature on traditional uses of Asteraceae plants for the treatment of parasites; (b) description of the major classes of chemical compounds from Asteraceae and their antiparasitic effects; and (c) antiparasitic activity with special reference to flavonoids and terpenoids. This review provides detailed information on the reported Asteraceae plant extracts found throughout the world and on isolated secondary metabolites that can inhibit protozoan parasites such as Plasmodium, Trypanosoma, Leishmania, and intestinal worms. Additionally, special attention is given to the Asteraceae plants of Odisha, used by the tribes of the area as antiparasitics. These plants are compared to the same plants used traditionally in other regions. Finally, we provide information on which plants identified in Odisha, India and related compounds show promise for the development of new drugs against parasitic diseases. For most of the plants discussed in this review, the active compounds still need to be isolated and tested further.
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Astalakshmi Narayanan and Senthilkumar Palaniappan. "Evaluation of Mussaenda erythrophylla Schumach. &Thonn. for Anthelmintic Activity." International Journal of Research in Pharmaceutical Sciences 12, no. 1 (January 6, 2021): 77–80. http://dx.doi.org/10.26452/ijrps.v12i1.3937.
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Medicinal plants are an essential source of treatment for various ailments. The Rubiaceae family is a rich source of medicinally important herbs. Mussaenda is an active member of the family Rubiaceae. It is largely seen in parks and gardens as an ornamental plant of India. It is a native of Western tropical Africa. Helminths are a wide choice of organisms which include worms such as parasitic intestinal worms, whipworms (Trichuris trichiura), (Ascaris lumbricoides) or hookworms (Necator americanus and Ancylostoma duodenale) etc. Helminthiasis is a condition of infection by worms. It is commonly known as worm infection As per WHO statistics near about 2 billion peoples are infected by soil-transmitted helminths worldwide. The infected class of peoples were found to be nutritionally and physically impaired. The current study aims at exploring the anthelmintic property of the leaves of Mussaenda erythrophylla Schumach. & Thonn. Anthelmintic properties of Mussaenda erythrophylla leaves extracts using petroleum ether(60-80°C), chloroform, ethyl acetate and methanol were evaluated against Phertima posthuma(Indian earth worms) at five concentrations viz.,10mg/ml,20mg/ml, 30mg/ml, 40mg/ml and 50mg/ml. Piperazine citrate is used as the reference standard. The duration taken for paralysis and death of the Phertima posthuma were assessed for all the groups. Methanolic extract of Mussaenda erythrophylla shows moderately significant anthelmintic property as compared to the non-treated group.
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SURES, B., and B. STREIT. "Eel parasite diversity and intermediate host abundance in the River Rhine, Germany." Parasitology 123, no. 2 (July 31, 2001): 185–91. http://dx.doi.org/10.1017/s0031182001008356.
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European eels (Anguilla anguilla) from 2 sampling sites on the Rhine river (near Karlsruhe and near Worms) were investigated with respect to their parasite communities. Nine different metazoan species were found to live in and on the eels. The highest number of species was recorded from the intestine, which contained up to 6 different helminths. Among these, acanthocephalans were the most prevalent worms with the eel-specific parasite Paratenuisentis ambiguus as the dominant species of the intestinal component communities at both sites. Comparing the intestinal parasites from eels caught near Karlsruhe with those from Worms, the acanthocephalans showed a significantly lower abundance at Worms. A significantly lower mean number of intestinal helminth species as well as a significantly lower Brillouin's Index was found at Worms compared with Karlsruhe. This difference could be related to the abundance of the respective intermediate crustacean hosts. At the sampling site Worms the amphipod Corophium curvispinum was the dominant crustacean. Additionally, only the isopod Jaera istri and the amphipod Dikerogammarus villosus were found. All these crustacean species have only recently colonized the Rhine river system via the Main-Danube canal, built in the early 1990s. They are not known to act as intermediate hosts for any of the acanthocephalans found in the eels. The site near Karlsruhe exhibited a higher crustacean diversity, including Asellus aquaticus and different species of the genus Gammarus, which are all known intermediate hosts for the acanthocephalans found. Therefore, changes of eel parasite diversity can be correlated with the appearance of invading crustacean species (neozoans).
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Renaldy, R. Bagus Yanuar, M. Ahda Naufal Aflahudin, Zukhaila Salma, Sumaryono Sumaryono, Muhammad Yasin Fitriah, Sri Wijayanti Sulistyawati, Dominicus Husada, and Sukmawati Basuki. "Intestinal Parasitic Infection, The Use of Latrine, and Clean Water Source In Elementary School Children At Coastal And Non-Coastal Areas, Sumenep District, Indonesia." Indonesian Journal of Tropical and Infectious Disease 9, no. 1 (April 27, 2021): 16. http://dx.doi.org/10.20473/ijtid.v9i1.22578.
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Inadequate latrine and water source cause transmission of intestinal parasitic infection, particularly in children. There is a lack information about it and it is needed to be investigated. This study aimed to compare the prevalence of intestinal parasitic infection, the use of latrine and clean water source in elementary school children at coastal and non-coastal areas in Sumenep District, Indonesia. An analytic observational study with cross sectional design was conducted in Dasuk Timur Elementary School located at coastal area, and Kolor II Elementary School at non-coastal area, Sumenep district, in January 2020. Intestinal parasites in students’ stools were identified by microscopic examination using wet direct smear stained with lugol. The use of latrine and water sources were analyzed with questionnaire. A total of 68 children stools were collected from both elementary schools. Worm infections were not found. Thirty-one children (31/44, 70.5%) from Dasuk Timur Elementary School and eight children (8/24, 33.3%) from Kolor II Elementary School were infected with intestinal protozoan and significant difference (P=0.003, Chi-square test). Blastocystis hominis was highly found in stools of Dasuk Timur Elementary School’s students (31/44, 70.5%) and significantly different from Kolor II Elementary School’s students (P<0.0001, Chi-square test). Three children (3/44, 6.8%) from Dasuk Timur Elementary School were still practicing open defecation. Dasuk Timur Elementary School’s students suffered from intestinal parasitic infection were mostly using non-piped water source (20/31, 64.5%) and were significantly different between two elementary schools (P=0.015, Fisher’s exact test). Prevalence of intestinal parasitic infections in children was found higher in coastal than non-coastal area due to the commonly use of unclean water sources and inadequate latrine.
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Lippens, Cédric, Bruno Faivre, Clothilde Lechenault, and Gabriele Sorci. "Aging parasites produce offspring with poor fitness prospects." Biology Letters 13, no. 2 (February 2017): 20160888. http://dx.doi.org/10.1098/rsbl.2016.0888.
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Senescing individuals have poor survival prospects and low fecundity. They can also produce offspring with reduced survival and reproductive success. We tested the effect of parental age on the performance of descendants in the nematode Heligmosomoides polygyrus , an intestinal parasite of rodents. We found that offspring of senescing worms had reduced within-host survival and reduced egg shedding over the first month post-infection compared with offspring produced by young parents. These results suggest that declining offspring quality is a component of senescence in parasitic nematodes and might have evolutionary consequences for the optimal schedule of age-dependent investment into reproductive effort.
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Siyadatpanah, Abolghasem, Abdol Sattar Pagheh, Ahmad Daryani, Shahabeddin Sarvi, Seyed Abdollah Hosseini, Roghayeh Norouzi, Larson Boundenga, et al. "Parasitic helminth infections of dogs, wolves, foxes, and golden jackals in Mazandaran Province, North of Iran." Veterinary World 13, no. 12 (2020): 2643–48. http://dx.doi.org/10.14202/vetworld.2020.2643-2648.
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Background and Aim: There is a large amount of information on intestinal parasites in stray dogs and golden jackals (Canis aureus) in Mazandaran Province, Iran. However, there is little information about foxes and wolves, which have a potential role in the spread of dangerous parasitic diseases, such as echinococcosis and toxocariasis. The aim of the present study was to identify the genus or species of parasitic worms in stool samples obtained from carnivores in Mazandaran Province, Iran, from August 2017 to April 2018. Materials and Methods: A total of 274 fecal samples were collected from carnivores, including dog, fox, wolf, and C. aureus in three areas of Mazandaran Province, Iran. All specimens were examined by centrifugal fecal flotation using a solution of Sheather's sugar to detect helminths eggs. Then, all samples were assessed using a light microscope. Data analysis was performed by SPSS version. 18 (Chicago, IL, USA). Results: In this study, seven genera of helminths were observed, including Ancylostoma, Uncinaria, Toxocara, Dipylidium, Toxascaris, Taenia, and Spirocerca. The prevalence of helminth infections was 97.7% (127 out of 130), 56.7% (51 out of 90), 51.4% (18 out of 35), and 52.6% (10 out of 19), among dogs, C. aureus, foxes, and wolves, respectively. The highest prevalence of Ancylostoma and Toxocara infections occurred in the eastern and central areas of the province (42.1% and 35.7%, respectively). Conclusion: Based on the results of this study, the infection with intestinal zoonotic helminths in carnivores was an important public health factor in Mazandaran. Therefore, these infections can be potentially harmful to humans and other animals.
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Tejareddy, Kandula Venkata, A. Venkanna Babu, K. Deepak Varma, and D. Bal Singh. "Ascaris lumbricoides causing jejunal perforation after trivial trauma." International Surgery Journal 4, no. 9 (August 24, 2017): 3169. http://dx.doi.org/10.18203/2349-2902.isj20173910.
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Ascariasis is one of the most common parasitic illnesses in human beings living in underdeveloped and developing countries. Infestation with this can result in wide range of manifestations. Most are asymptomatic, very few patients may develop complications like obstruction, perforation, cholangiohepatitis, pancreatitis, etc. We came across a patient, 20-year-old male who presented to the emergency department with acute abdomen followed by trivial trauma, investigations lead to peritonitis as diagnosis. On emergency laparotomy, unexpectedly Ascaris worms wriggling through jejunal perforation and live adult worms freely floating in peritoneal cavity were seen. It is suggested that trivial trauma might have exacerbated impending Ascaris perforation. A jejunal perforation of Ascaris after trivial trauma is a rare entity. This unique case has highlighted the fact that Ascaris can lead to intestinal perforation in heavily infested individuals particularly in tropical countries following trivial trauma.
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Parker, Jenna M., Shifra Z. Goldenberg, David Letitiya, and George Wittemyer. "Strongylid infection varies with age, sex, movement and social factors in wild African elephants." Parasitology 147, no. 3 (January 9, 2020): 348–59. http://dx.doi.org/10.1017/s0031182019001653.
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AbstractComparing parasitic infection among individuals of wildlife populations can provide insight into factors that influence wildlife disease ecology. Strongylids are parasitic worms that infect the intestinal tract of vertebrates, and infection with strongylids can be approximated by counting strongylid eggs in dung samples. Here we tested for correlations between strongylid egg counts and 18 different individual characteristics, environmental and social factors in individually known wild African elephants. We counted more eggs in the dung samples of younger elephants and females relative to mature elephants and males. We also found that elephants spending more time outside reserves shed more strongylid eggs than elephants that were more often within reserves. Elephants that were less socially integrated, as measured by how much aggression they received from other elephants, shed fewer strongylid eggs; relatedly, socially isolated orphan elephants that had left their family shed fewer strongylid eggs than elephants that remained with their family. Our results suggest that landscapes altered by livestock grazing and social disruption caused by humans may impact parasitic infection in wildlife.
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Tine, Roger C. K., Babacar Faye, Cheikh T. Ndour, Khadime Sylla, Doudou Sow, Magatte Ndiaye, Jean L. Ndiaye, et al. "Parasitic Infections among Children under Five Years in Senegal: Prevalence and Effect on Anaemia and Nutritional Status." ISRN Parasitology 2013 (December 26, 2013): 1–6. http://dx.doi.org/10.5402/2013/272701.
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Although malaria is declining in many countries in Africa, malaria and anaemia remain frequent in children. This study was conducted to assess the relationship between malaria parasitaemia, intestinal worms, and anaemia, in children <5 years living in low transmission area in Senegal. A survey was carried out in 30 villages in the central part of Senegal. A two-level random cluster sampling technique was used to select study participant. Children <5 years were enrolled after informed consent. For each child, blood thick and smear tests were performed, haemoglobin concentration was measured with HemoCue, and stool samples were collected and examined using the Ritchie technique. A total of 736 children were recruited. Malaria parasite prevalence was 1.5% (0.7–2.6); anaemia was found in 53.4% (48.2–58.9), while intestinal parasites and stunting represented 26.2% (22.6–30.2) and 22% (18.6–25.5), respectively. In a logistic regression analysis, anaemia was significantly associated with malaria parasitaemia (aOR= 6.3 (1.5–53.5)) and stunting (aOR = 2 (1.2–3.1)); no association was found between intestinal parasites and anaemia. Malaria and anaemia remain closely associated even when malaria is declining. Scaling up antimalarial interventions may contribute to eliminate malaria and reduce the occurrence of anaemia among children.
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Griffin, Christine T. "Oswaldocruzia filiformis (Nematoda: Trichostrongyloidea) in frogs (Rana temporaria) from three locations in Ireland." Journal of Helminthology 63, no. 1 (March 1989): 53–62. http://dx.doi.org/10.1017/s0022149x00008737.
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ABSTRACTA total of 444 adult frogs (Rana temporaria) were obtained from three sites in the east of Ireland. Oswaldocruzia filiformis was present at all times of the year; overall, 64% of the frogs were infected, with a mean burden of 5 worms/frog. Most of the parasites were in the first half of the small intestine. A single gross lesion associated with a high worm burden is described. Female parasites were more abundant than males. Most parasitic stages of O. filiformis overwintered in hibernating hosts. Seasonal patterns in the levels of parasitization were not discerned. The intensity of infection was significantly greater in female than male frogs at one of the sites. There was little correlation between the size of host and degree of parasitization. None of the 45 frog tadpoles examined harboured O. filiformis. Frogs became infected by August of their first year.
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Rafika, Rafika, Hasria Alang, and Hartini Hartini. "Edukasi Cuci Tangan dan Pemeriksaan Telur Cacing Pada Kuku Tangan Siswa SD Inpres Pampang 1 Makassar." Poltekita: Jurnal Pengabdian Masyarakat 1, no. 1 (May 18, 2020): 15–22. http://dx.doi.org/10.33860/pjpm.v1i1.71.
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Intestinal worm disease is one of the parasitic diseases that still infect humans, especially children. School-age children, especially elementary school children, are generally less familiar with self-sanitation. Most diseases of the worms are transmitted through dirty hands. Community service at SD Inpres Pampang 1 was done to educate students about the implementation of good self-sanitation and precisely how to wash hands based on WHO standards. The tools used in this study were chalkboard, camera, microscope, reaction tube, glass object, glass cover, container/basin, stirrer rod, glass beaker, tube rack, petri dish, nail clippers, and pens. The materials used in this training were hand nails students SD Inpres Pampang 1, water, and salt. Based on the results and evaluation, it concludes 1) Worm infections can occur when there are worm eggs attached to the nails that are swallowed in with food. 2) improving participants ' understanding and knowledge of self-sanitation for everyday life, especially the right-hand washing way.
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Anastasiou, Evilena, Anastasia Papathanasiou, Lynne A. Schepartz, and Piers D. Mitchell. "Infectious disease in the ancient Aegean: Intestinal parasitic worms in the Neolithic to Roman Period inhabitants of Kea, Greece." Journal of Archaeological Science: Reports 17 (February 2018): 860–64. http://dx.doi.org/10.1016/j.jasrep.2017.11.006.
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Chaudhuri, J., R. E. Martin, and M. J. Donahue. "Evidence for the absorption and synthesis of 5-hydroxytryptamine in perfused muscle and intestinal tissue and whole worms of adult Ascaris suum." Parasitology 96, no. 1 (February 1988): 157–70. http://dx.doi.org/10.1017/s0031182000081737.
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SUMMARYThe metabolites of 5-hydroxytryptamine (5-HT, serotonin) namely, L-tryptophan, 5-hydroxytryptophan, 5-hydroxyindole acetic acid and 5-hydroxytryptophol were measured in perfused tissue and whole worms from adult female Ascaris suum using reversed-phase liquid chromatography with electrochemical detection. The intracellular levels of each metabolite were quantitated in response to several physiological effectors but only Ltryptophan (TRP) caused dose-dependent changes in these metabolites. Serotonin itself could also be absorbed by perfused A. suum muscle and intestinal tissue. When live A. suum were tied at the anterior and posterior regions to restrict TRP absorption by the intestine, TRP was absorbed through the cuticle and converted into 5-HT by the muscle tissue. In untied live parasites TRP absorption was observed in both muscle and intestinal tissue. Collectively, the data indicated that 5-HT may be either absorbed directly or synthesized de novo from absorbed TRP in the isolated tissue of A. suum. The 5-HT, in the live adult female A. suum, can be synthesized de novo from TRP, or 5-HT can be absorbed from the environment both through the cuticle and by the intestine of living parasites. Data also indicated that there was preferential sequestering of 5-HT and the metabolites of 5-HT in the anterior tissues of the worms.