Academic literature on the topic 'Schistosoma intercalatum'
Create a spot-on reference in APA, MLA, Chicago, Harvard, and other styles
Consult the lists of relevant articles, books, theses, conference reports, and other scholarly sources on the topic 'Schistosoma intercalatum.'
Next to every source in the list of references, there is an 'Add to bibliography' button. Press on it, and we will generate automatically the bibliographic reference to the chosen work in the citation style you need: APA, MLA, Harvard, Chicago, Vancouver, etc.
You can also download the full text of the academic publication as pdf and read online its abstract whenever available in the metadata.
Journal articles on the topic "Schistosoma intercalatum"
1
MORAND, S., V. R. SOUTHGATE, and J. JOURDANE. "A model to explain the replacement of Schistosoma intercalatum by Schistosoma haematobium and the hybrid S. intercalatum×S. haematobium in areas of sympatry." Parasitology 124, no. 4 (April 2002): 401–8. http://dx.doi.org/10.1017/s0031182001001342.
Full textAbstract:
Numerous hypotheses have been postulated to explain the rapidly changing parasitological situation in Loum, Cameroon as a result of the interaction between Schistosoma haematobium and S. intercalatum. The aim of this study is to test the various hypotheses using a simple mathematical model, incorporating equal and unequal sex ratios of adult schistosomes, recombinations, and levels of compatibility with the intermediate molluscan hosts, B. forskalii and B. truncatus. The model assuming an equal sex ratio does not fit with the existing field data in that it predicts a continued presence of S. intercalatum, S. haematobium and the hybrids. The model assuming a sex bias in favour of males, which reflects the situation usually observed in schistosome populations, predicts the loss S. intercalatum which indeed concurs with the most recent data.
2
Fernández-Soto, Pedro, Catalina Avendaño, Anna Sala-Vizcaíno, Beatriz Crego-Vicente, Begoña Febrer-Sendra, Juan García-Bernalt Diego, Ana Oleaga, et al. "Molecular Markers for Detecting Schistosoma Species by Loop-Mediated Isothermal Amplification." Disease Markers 2020 (July 24, 2020): 1–11. http://dx.doi.org/10.1155/2020/8042705.
Full textAbstract:
Schistosomiasis is considered a neglected parasitic disease. Around 280,000 people die from it annually, and more than 779 million people are at risk of getting infected. The schistosome species which infect human beings are Schistosoma mansoni, Schistosoma haematobium, Schistosoma intercalatum, Schistosoma japonicum, Schistosoma guineensis, and Schistosoma mekongi. This disease is also of veterinary significance; the most important species being Schistosoma bovis since it causes the disease in around 160 million livestock in Africa and Asia. This work was aimed at designing and developing a genus-specific loop-mediated isothermal amplification (LAMP) method for detecting the most important schistosome species affecting humans and for the species-specific detection of S. bovis. Bioinformatics tools were used for primer design, and the LAMP method was standardised for detecting the ITS-1 region from S. intercalatum, S. haematobium, S. mansoni, S. japonicum, and S. bovis DNA (generic test) and the NADH 1 gene for specifically detecting S. bovis (at different DNA concentrations). Detection limits achieved were 1 pg DNA for S. mansoni, 0.1 pg for S. haematobium, 1 pg for S. intercalatum, and 10 pg for S. bovis. No amplification for S. japonicum DNA was obtained. The LAMP designed for the amplification of S. bovis NADH-1 worked specifically for this species, and no other DNA from other schistosome species included in the study was amplified. Two highly sensitive LAMP methods for detecting different Schistosoma species important for human and veterinary health were standardised. These methods could be very useful for the diagnosis and surveillance of schistosome infections.
3
WEBSTER, B. L., and V. R. SOUTHGATE. "Mating interactions of Schistosoma haematobium and S. intercalatum with their hybrid offspring." Parasitology 126, no. 4 (April 2003): 327–38. http://dx.doi.org/10.1017/s0031182002002883.
Full textAbstract:
Experiments were designed to study the mating behaviour between the Schistosoma haematobium [male ]×S. intercalatum [female] hybrid and the 2 parental species S. haematobium and S. intercalatum. Individual worms were identified by electrophoretic analysis of glucose-6-phosphate dehydrogenase, which was characteristic for each isolate. Analysis of the data obtained showed that both heterospecific and homospecific pairs formed between the hybrids and S. haematobium and S. intercalatum. S. haematobium and the hybrid are better than S. intercalatum in forming pairs, and S. haematobium showed a greater homospecific mate preference compared with the hybrid. Analysis of the data using the Mantel-Haenszel test suggests that mating competition does exist between the schistosomes, with the hybrid being dominant over both the parental species and S. haematobium being dominant over S. intercalatum. The hybrid males showed a greater ability than S. intercalatum and S. haematobium males in taking away S. haematobium and S. intercalatum females from their homospecific males when introduced into a pre-established S. haematobium or S. intercalatum infection. They were able to take females from S. intercalatum homospecific pairs more easily compared with females from S. haematobium homospecific pairs. The significance of the results is discussed in relation to the epidemiological changes of schistosomiasis in Cameroon, where hybridization between S. haematobium and S. intercalatum has taken place, with S. haematobium and the hybrid managing to replace the endemic S. intercalatum over the last 30 years.
4
PICA-MATTOCCIA, L., R. MORONI, L. A. TCHUEM TCHUENTÉ, V. R. SOUTHGATE, and D. CIOLI. "Changes of mate occur in Schistosoma mansoni." Parasitology 120, no. 5 (May 2000): 495–500. http://dx.doi.org/10.1017/s0031182099005685.
Full textAbstract:
Male and female schistosomes are generally assumed to form stable monogamous pairs for the whole span of their long existence in the mammalian host. Recent evidence from mixed infections has shown that Schistosoma mansoni males can displace S. intercalatum males from their homologous partners, but no information exists about the existence of similar phenomena within a single schistosome species. Here, we determine whether male S. mansoni can displace males of the same species from pre-formed pairs in vivo. The availability of clear-cut genetic markers of drug resistance in schistosomes was exploited to show that hycanthone sensitive S. mansoni males can displace homospecific hycanthone resistant males from pre-formed pairs and vice versa. The frequency of changes is dependent on the magnitude of the excess single males competing with paired worms. The possible mechanics and the biological significance of mate changing are discussed.
5
WEBSTER, B. L., and V. R. SOUTHGATE. "Compatibility of Schistosoma haematobium, S. intercalatum and their hybrids with Bulinus truncatus and B. forskalii." Parasitology 127, no. 3 (September 2003): 231–42. http://dx.doi.org/10.1017/s0031182003003597.
Full textAbstract:
Schistosoma haematobium and S. intercalatum readily hybridize with each other producing generations of viable hybrid offspring. Experiments were designed to investigate the infectivity and viability of the S. haematobium×S. intercalatum F1 and F2 hybrid larvae in their two intermediate snail hosts compared with the parental species. Analysis of the data obtained suggested that the S. haematobium [male ]×S. intercalatum [female] F1 hybrid miracidia were more infective to Bulinus truncatus than to B. forskalii, and also more infective to B. truncatus compared with the parental S. haematobium miracidia. This hybrid was also observed to have a greater cercarial productivity from both intermediate hosts and these cercariae were shown to be more infectious and to have a longer longevity compared with the cercariae of S. haematobium, S. intercalatum and the S. haematobium [female]×S. intercalatum [male ] F1 hybrid cercariae. The S. haematobium [female]×S. intercalatum [male ] F1 hybrid was shown not to be very successful in all stages of the investigations. The results indicate that the S. haematobium [male ]×S. intercalatum [female] F1 hybrid may have many reproductive advantages over the reciprocal hybrid and the parental schistosome species. The significance of the results is discussed in relation to the epidemiological consequences occurring in Loum, Cameroon, and other areas where S. haematobium and S. intercalatum are sympatric and able to hybridize.
6
Rusjdi, Selfi Renita. "SCHISTOSOMIASIS, Hubungan Respon Imun dan Perubahan Patologi." Majalah Kedokteran Andalas 35, no. 2 (August 29, 2011): 81. http://dx.doi.org/10.22338/mka.v35.i2.p81-90.2011.
Full textAbstract:
AbstrakSchistosomiasis merupakan suatu penyakit tropik yang disebabkan oleh cacing genus Schistosoma. Spesies yang dapat menginfeksi manusia antara lain Schistosoma mansoni, Schistosoma japonicum, Schistosoma mekongi, Schistosoma haematobium dan Schistosoma intercalatum. Penyakit ini telah menyerang 200 juta orang penduduk di negara berkembang. Penularan pada manusia terjadi dengan cara serkaria menembus kulit sewaktu kontak dengan air yang mengandung serkaria.Respon imun pada penderita schistosomiasis terhadap antigen cacing dan telurnya mempengaruhi perjalanan penyakit dan klinis yang ditimbulkan. Status imunitas menentukan perubahan patologi yang akan terjadi seperti pembentukan granuloma, gangguan terhadap organ atau bahkan melindungi penderita terhadap kejadian infeksi berat. Pada keadaan tertentu cacing schistosoma dapat bertahan selama bertahun – tahun meskipun hospes mempunyai respon imun yang kuat.Gejala schistosomiasis akut dapat berupa demam, malaise, mialgia, batuk, sakit kepala dan nyeri abdomen yang dikenal dengan sindroma Katayama. Gejala akut ini sering muncul pada orang yang mengalami infeksi pertama kali. Pada keadaan kronik, schistosomiasis dapat menimbulkan kerusakan organ berupa fibrosis, striktur dan kalsifikasi.Kata Kunci : schistosimiasis, sindroma Katayama, fibrosis, granulomaAbstractSchistosomiasis is a tropical disease which is caused by helminth of genus schistosoma.Species of schistosoma which can infect human are Schistosoma mansoni, Schistosoma japonicum, Schistosoma mekongi, Schistosoma haematobium and Schistosoma intercalatum. Schistosoma has infected 200 million people in developing countries. It is transmitted to human when the free living cercariae penetrate the skin in contaminated water.Immune response to somatic and egg antigen determine natural history of disease and clinical symptom. Immunity is responsible for pathological changes which formed granuloma, organ disfunction and even able to protect the body from heavy infection. In certain case, schistosomiasis can persist for years in host with strong immunity.TINJAUAN PUSTAKA82Symptoms of acute schistosomiasis also called Katayama syndrome are fever, malaise, myalgia, cough, headache and abdominal pain. The acute symptome frequently occur in first schistosomal infection. In chronic case, it can cause organ damage such fibrosis, stricture and calsification.Key word: schistosimiasis, sindroma Katayama, fibrosis, granuloma
7
Tchuenté, L. A. Tchuem, V. R. Southgate, D. Imbert-Establet, and J. Jourdane. "Change of mate and mating competition between males of Schistosoma intercalation and S. mansoni." Parasitology 110, no. 1 (January 1995): 45–52. http://dx.doi.org/10.1017/s0031182000081038.
Full textAbstract:
Previous studies on mating behaviour of Schistosoma intercalatum and S. mansoni, two human schistosomes which may overlap in parts of Africa, have shown that in mixed infections in mice there are no physiological barriers preventing heterospecific pairings. However, when choice is possible, matings occur preferentially between partners of the same species. In this paper, further experimental studies on mating behaviour of the two species were conducted. Sequential infections showed that heterospecific pairs of worms change partners to homospecific pairs when given the opportunity. The change of mate is a progressive process requiring up to, at least 8 weeks, and this phenomenon is due to the male worm seeking the appropriate female. S. mansoni males are better at pairing with females than S. intercalcatum males, and they will change partner to pair with homologous females in preference to heterologous females whenever given the opportunity. Moreover, in the absence of S. mansoni female worms, unpaired S. mansoni male worms pull away female S. intercalatum from male S. intercalatum. It appears from this study that S. mansoni males are much more competitive than S. intercalatum males at pairing with females, and this is a disadvantage for S. intercalatum in situations of sympatry.
8
Otuneme, O. Gladys, FO Akinkuade, O. Oluwasola Obebe, OS Usiobeigbe, TG Faloye, AS Olasebikan, WA Akinleye, and OD Koku. "A study on the prevalence of Schistosoma Haematobium and Schistosoma Intercalatum in a rural community of Ogun State, Nigeria." South East Asia Journal of Public Health 4, no. 1 (February 2, 2015): 67–71. http://dx.doi.org/10.3329/seajph.v4i1.21845.
Full textAbstract:
Urinary Schistosomiasis is endemic in Nigeria and continues to pose public health challenges especially in inhabitants of rural areas. This study was conducted in an attempt to determine the co-infection of Schistosoma haematobium and S. intercalatum in Apojola Community area of Abeokuta North LGA of Ogun State, Nigeria. Urine samples were analyzed in the Laboratory using sedimentation/centrifugation technique to determine schistosoma eggs. Positive urine samples were further confirmed using Ziehl-Neelsen (zn) staining method for differentiating S. haematobium from S. intercalatum eggs. The results indicate that 79 (52.7%) of the urine samples collected were positive for schistosoma eggs. Among the positive urine samples, 62% had S.haematobium while 38% had S. intercalatum eggs. Infections were found to be high in males 39 (55.7%) than female 40 (50%). Villagers who were <13 years of age had the highest prevalence rate of infection. Co-infection of S. haematobium and S. intercalatum among the villagers was established in the study and was observed to be highest in the age group <13years, compared to other age group. The study confirmed the endemicity and the co-infection of S. haematobium and S. intercalatum in the study area. It is therefore recommended that water control, sanitation and snails elimination as well as community-based programs are urgently needed to reduce S. haematobium and S. intercalatum infection.DOI: http://dx.doi.org/10.3329/seajph.v4i1.21845 South East Asia Journal of Public Health Vol.4(1) 2014: 67-71
9
Almeda, J., C. Ascaso, G. A. Marçal, M. Corachan, V. R. Southgate, and D. Rollinson. "Morphometric variability of Schistosoma intercalatum eggs: a diagnostic dilemma." Journal of Helminthology 70, no. 2 (June 1996): 97–102. http://dx.doi.org/10.1017/s0022149x00015224.
Full textAbstract:
AbstractVariability of Schistosoma intercalatum eggs in shape and size, and their similarity to those of S. haematobium presented a problem of species identification when egg morphology was the diagnostic criterion used in a study of human schistosomiasis conducted on São Tomé and Principe. More than 2500 egg measurements were obtained by light micoscopy to gather data relating to size variability of S. intercalatum eggs, to evaluate whether factors such as age of host, sex of host and intensity of infection are correlated with variability, and the data were compared with previously published measurements on different isolates and strains of S. intercalatum: the range in length (104–203 μm) embraces most of the measurements reported in other studies of S. intercalatum eggs. There was no correlation either between age and sex of the host, or intensity of infection with variability of egg size. Comparison between measurements of the eggs of S. haematobium, S. intercalatum and S. bovis eggs are presented.
10
Odoya, E. M., E. U. Edosomwa, O. I. Iribhogbe, A. A. Damina, and O. A. Asojo. "Intestinal schistosomiasis in an apparently healthy rural population in Bayelsa State, Nigeria." African Journal of Clinical and Experimental Microbiology 22, no. 2 (April 8, 2021): 187–95. http://dx.doi.org/10.4314/ajcem.v22i2.11.
Full textAbstract:
Background: Schistosomiasis is endemic in Nigeria and three species; Schistosoma haematobium, Schistosoma mansoni, and Schistosoma intercalatum have been reported in Niger Delta, Nigeria. This study aimed to determine the prevalence of schistosomiasis in rural communities of Bayelsa State, Nigeria.Methodology: Four rural homogeneous communities; Otuegala, Immiringi, Otuesega, and Ibelebiri in Ogbia Local Government Area of Bayelsa State, Nigeria, were randomly selected for the study. A structured questionnaire was administered to each participant in their native language and used to collect participant’s biodata and swimming history. Stool samples collected from all participants were examined qualitatively by wet preparation and after formolethol concentration. Data were analyzed using SPSS version 20.0 software and results presented in proportion and tables.Results: A total of 829 participants (age range 1 - 80 years) were recruited for the study. Helminth ova were identified in the stool samples of 218 (26.3%) participants. Among 380 males examined, 82 (21.6%) were infected, while out of 449 females examined, 138 (30.3%) were infected. The ova of seven helminths identified and their frequency of occurrence were; S. intercalatum 86 (10.4%), Ascaris lumbricoides 53 (6.4%), S. mansoni 35 (4.2%), Trichuris trichiura 22 (2.6%), hookworm 20 (2.4%) and Taenia spp 2 (0.2%). Schistosoma haematobium was identified in non-urine contaminated stool sample of an eight-year old boy. A total of 11 (1.3%) participants had double infections, affecting 7 (63.6%) females and 4 (36.4%) males, with the commonest combination being S. intercalatum and A.lumbricoides 6 (0.7%), followed by S. intercalatum and hookworm 4 (0.5%), and S. mansoni and hookworm 1(0.1%).Conclusion: S. intercalatum was the most prevalent intestinal helminthic infection in this study, which is a rare finding in most epidemiological investigations. The affinity of Schistosoma species to establish double infections with hookworm and other intestinal helminths should be taken into account during chemoprophylaxis.
Keywords: Schistosomiasis, Chemoprophylaxis, Prevalence, Rural Population
Dissertations / Theses on the topic "Schistosoma intercalatum"
1
Pagès, Jean-René. "Variabilité génétique et hybridations chez les schistosomes le modèle Schistosoma intercalatum et espèces voisines /." Grenoble 2 : ANRT, 1988. http://catalogue.bnf.fr/ark:/12148/cb376172731.
Full text
2
Pagès, Jean-René. "Variabilité génétique et hybridations chez les Schistosomes : le modèle Schistosoma intercalatum et espèces voisines." Montpellier 2, 1988. http://www.theses.fr/1988MON20065.
Full textAbstract:
Variabilite genetique de schistosoma intercalatum etudiee par la morphologie et la biometrie des oeufs, la chronobiologie des emissions cercariennes et le developpement intramolluscal; divergence entre les souches camerounaises et zairoises
3
RELTIEN, JEROME. "Les bilharzioses au gabon : premiere etude statistique et morphologique d'un foyer d'hybridation naturelle entre schistosoma haematobium et schistosoma intercalatum." Nice, 1988. http://www.theses.fr/1988NICE6507.
Full text
4
Tchuem, Tchuenté Louis-Albert. "Interactions hôte-parasite et compétition interspécifique dans le modèle Schistosoma intercalatum : implications épidémiologiques." Perpignan, 1993. http://www.theses.fr/1993PERP0149.
Full textAbstract:
L'espece schistosoma intercalatum, agent de la schistosomose rectale en afrique, offre un double interet: fondamental par les questions non resolues que posent sa biologie et son ecologie, applique lie a la morbidite encore mal appreciee qu'elle cause chez l'homme. Les recherches experimentales de ce travail portent sur l'etude des interactions hote-parasite a la fois au niveau du compartiment mollusque et du compartiment vertebre, et des mecanismes de competition interspecifique dans les infestations mixtes s. Intercalatum-s. Mansoni. Il a ete demontre l'existence d'une compatibilite presque parfaite entre s. Intercalatum (souche de basse guinee) et differentes populations de b. Forskalii, originaires ou non de pays d'endemie. L'etude de la permissivite des rongeurs sauvages a montre que arvicanthis niloticus est un hote particulierement permissif vis-a-vis de s. Intercalatum, confirmant ainsi les hypotheses anciennes sur la participation possible des rongeurs dans le cycle de s. Intercalatum soit en qualite d'hotes reservoirs, soit en qualite d'hotes definitifs. L'etude des interactions entre s. Intercalatum et s. Mansoni a demontre l'existence de plusieurs mecanismes d'isolement reproductif prezygotique entre les deux especes. Ces mecanismes sont d'ordre immunologique et d'ordre sexuel. Sur le plan immunologique, il a ete mis en evidence qu'une primo-infestation par s. Mansoni immunise tres significativement le vertebre contre s. Intercalatum, ce qui contribue a limiter la rencontre entre les deux especes. Sur le plan sexuel, les infestations simultanees s. Intercalatum-s. Mansoni ont revele, pour la premiere fois chez les schistosomes, l'existence de mecanismes de reconnaissance favorisant l'appariement entre partenaires de la meme espece. La preference homospecifique d'accouplement est si forte qu'elle peut impliquer un changement de partenaire. Il a enfin ete demontre que les couples heterospecifiques engendrent par parthenogenese meiotique heploide une descendance sterile. Ce travail s'ouvre vers des applications epidemiologiques dans la mesure ou certains resultats experimentaux sont de nature a expliquer les mecanismes s'opposant a l'extension geographique de s. Intercalatum.
5
"Morbidity of Schistosoma intercalatum: A controlled population based study in Edea, Cameroun." Tulane University, 1991.
Find full textAbstract:
The objectives of this study were to assess morbidity from Schistosoma intercalatum infection, identify associated risk factors and evaluate the relative sensitivity of alternate diagnostic methods in the known focus of Edea, Cameroon The study design combined a population-based cross-sectional survey with case control and double blind features. Cases identified in the survey by Kato-thick smear analysis of stool samples were matched, by age groups, to randomly selected stool negative subjects Repeated fecal examinations were more sensitive (51 positive) than rectal biopsy (45 positive), which has the disadvantage of discomfort, and caused severe bleeding in three subjects The sex difference was significant only in age group 10-19. Only subjects aged 10-19 had a positive physical sign (splenomegaly) associated with infection, (OR = indefinite; P =.02), although for all below age 20 there was some evidence of association (OR = 6.13; p =.06) Cases sought medical consultation during the previous year more often than did controls (P =.01). Among those who had curtailed activities within 21 to 28 days, cases had longer periods of absence from normal activities (3.0 days vs 1.76) A history of abdominal pain in the past 21 to 28 days was positively associated with infection (OR = 2.63; P =.04), with the relationship stronger below age 20 (OR = 5.89; P =.004). This relationship was much stronger among cases free of ascaris and ancylostoma (OR = 10; P =.03). A history of abdominal pain increased infrequency with intensity of infection. Under age 20, nausea and blood in stool were more frequent in cases than controls (OR respectively 2.83 and 2.25). The absolute (and relative) eosinophil count mean was higher in cases (987.7 $\pm$ 915.2) than in controls (609.3 $\pm$ 765.6)(P =.06) Rectal mucosal lesions were associated with infection (P =.02). Only cases had sand paper and/or multiple lesions (19%). Eggs were found mostly in the submucosa, but also in the mucosa of cases passing over 400 eggs per gram of stool. Follicular colitis was associated with infection (OR = 3.38; P =.01). No evidence of peri-portal fibrosis was found among 57 cases examined by ultrasonography. (Abstract shortened with permission of author.)acase@tulane.edu
Books on the topic "Schistosoma intercalatum"
1
G, Chen M., Mott Kenneth E, and WHO Parasitic Diseases Programme. Schistosomiasis Unit., eds. Progress in assessment of morbidity due to schistosomiasis: Reviews of recent literature : Schistosoma haematobium, Schistosoma intercalatum, Schistosoma japonicum, Schistosoma mansoni. London: Bureau of Hygiene and Tropical Diseases, 1989.
Find full textBook chapters on the topic "Schistosoma intercalatum"
1
Ringelmann, R., and Beate Heym. "Schistosoma intercalatum." In Parasiten des Menschen, 225–26. Heidelberg: Steinkopff, 1991. http://dx.doi.org/10.1007/978-3-642-85397-5_82.
Full text
2
King, Charles H. "Disease Due to Schistosoma mekongi, S. intercalatum and Other Schistosome Species." In Schistosomiasis, 391–412. PUBLISHED BY IMPERIAL COLLEGE PRESS AND DISTRIBUTED BY WORLD SCIENTIFIC PUBLISHING CO., 2001. http://dx.doi.org/10.1142/9781848161511_0011.
Full text