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Relevant bibliographies by topics / Toxigenic strains

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Academic literature on the topic 'Toxigenic strains'

Author: Grafiati

Published: 5 June 2025

Last updated: 2 August 2025

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Journal articles on the topic "Toxigenic strains"

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Chen, F., G. M. Evins, W. L. Cook, R. Almeida, N. Hargrett-Bean, and K. Wachsmuth. "Genetic diversity among toxigenic and nontoxigenicVibrio choleraeO1 isolated from the Western Hemisphere." Epidemiology and Infection 107, no. 1 (1991): 225–33. http://dx.doi.org/10.1017/s0950268800048846.

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SUMMARYMultilocus enzyme electrophoresis was used to examine genetic relationships among and between toxigenic and non-toxigenic isolates ofVibrio choleraeO1 obtained from patients and the environment in the US Gulf Coast and surrounding areas. A total of 23 toxigenic and 23 non-toxigenic strains were examined. All the toxigenic and 7 of the non-toxigenic strains had the same alleles at 16 enzyme loci, whereas the balance of the nontoxigenic strains had 9 distinct combinations of alleles. This study suggests that all of the toxigenic strains belong to a single clone, and that while some of the

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Pang, Bo, Meiying Yan, Zhigang Cui, et al. "Genetic Diversity of Toxigenic and Nontoxigenic Vibrio cholerae Serogroups O1 and O139 Revealed by Array-Based Comparative Genomic Hybridization." Journal of Bacteriology 189, no. 13 (2007): 4837–49. http://dx.doi.org/10.1128/jb.01959-06.

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ABSTRACT Toxigenic serogroups O1 and O139 of Vibrio cholerae may cause cholera epidemics or pandemics. Nontoxigenic strains within these serogroups also exist in the environment, and also some may cause sporadic cases of disease. Herein, we investigate the genomic diversity among toxigenic and nontoxigenic O1 and O139 strains by comparative genomic microarray hybridization with the genome of El Tor strain N16961 as a base. Conservation of the toxigenic O1 El Tor and O139 strains is found as previously reported, whereas accumulation of genome changes was documented in toxigenic El Tor strains i

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Zadnova, Svetlana P., Nikita A. Plekhanov, Alina Yu Spirina, and Andrey A. Kritskiy. "Comparative analysis of the structure and expression of the <i>vasH</i> regulatory gene of type VI secretion system in toxigenic and non-toxigenic <i>Vibrio cholerae</i> strains." Journal of microbiology, epidemiology and immunobiology 99, no. 6 (2023): 682–91. http://dx.doi.org/10.36233/0372-9311-255.

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Objective. The comparative analysis of the structure of the regulatory gene vasH of the type VI secretion system and its expression in toxigenic and non-toxigenic V. cholerae O1, biovar El Tor strains. Materials and methods. We used 35 strains isolated from patients and from the environmental samples in the territory of Russia and Ukraine between 1970 and 2017. Analysis of the structure of the vasH gene and the amino acid sequence of the protein was carried out using Ugene 1.32, Mega X, and Bioedit v. 7.0.9.0. The relative level of vasH expression was studied by 2Ct. Results. The T

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Safa, Ashrafus, Nurul A. Bhuiyan, Denise Murphy, et al. "Multilocus genetic analysis reveals that the Australian strains of Vibrio cholerae O1 are similar to the pre-seventh pandemic strains of the El Tor biotype." Journal of Medical Microbiology 58, no. 1 (2009): 105–11. http://dx.doi.org/10.1099/jmm.0.004333-0.

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Episodes of cholera stemming from indigenous Vibrio cholerae strains in Australia are mainly associated with environmental sources. In the present study, 10 V. cholerae O1 strains of Australian origin were characterized. All of the strains were serogroup O1 and their conventional phenotypic traits categorized them as belonging to the El Tor biotype. Genetic screening of 12 genomic regions that are associated with virulence in V. cholerae showed variable results. Analysis of the ctxAB gene showed that the Australian environmental reservoir contains both toxigenic and non-toxigenic V. cholerae s

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Josselin, Laurie, Caroline De Clerck, Marthe De Boevre, et al. "Volatile Organic Compounds Emitted by Aspergillus flavus Strains Producing or Not Aflatoxin B1." Toxins 13, no. 10 (2021): 705. http://dx.doi.org/10.3390/toxins13100705.

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Aspergillus flavus is a phytopathogenic fungus able to produce aflatoxin B1 (AFB1), a carcinogenic mycotoxin that can contaminate several crops and food commodities. In A. flavus, two different kinds of strains can co-exist: toxigenic and non-toxigenic strains. Microbial-derived volatile organic compounds (mVOCs) emitted by toxigenic and non-toxigenic strains of A. flavus were analyzed by solid phase microextraction (SPME) coupled with gas chromatography–mass spectrometry (GC-MS) in a time-lapse experiment after inoculation. Among the 84 mVOCs emitted, 44 were previously listed in the scientif

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Miller, Christopher J., Bohumil S. Drasar, Richard G. Feachem, and Richard J. Hayes. "The impact of physico-chemical stress on the toxigenicity ofVibrio cholerae." Journal of Hygiene 96, no. 1 (1986): 49–57. http://dx.doi.org/10.1017/s0022172400062525.

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SUMMARYThe expression of toxigenicity byVibrio cholerae, before and after exposure to various conditions of salinity, pH and cation composition and concentration, has been measured. Exposure to these conditions did not select for hyper- or hypo-toxigenic strains. This suggests that toxigenicV. choleraeO 1 are unlikely to lose their toxigenicity when exposed to environmental stress and thatV. choleraetoxin production is not a response to the stresses included in this study. These results are consistent with an aquatic reservoir for toxigenicV. choleraeO 1.

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Samir, Ahmed, Khaled A. Abdel-Moein, and Hala M. Zaher. "Molecular Detection of Toxigenic Clostridioides difficile among Diarrheic Dogs and Cats: A Mounting Public Health Concern." Veterinary Sciences 8, no. 6 (2021): 88. http://dx.doi.org/10.3390/vetsci8060088.

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Nowadays, pet animals are known to be asymptomatic carriers of Clostridioidesdifficile. This study was conducted to investigate the burden of toxigenic C. difficile among diarrheic dogs and cats using direct PCR on fecal samples to reveal better insights about the epidemiology of such toxigenic strains referring to its public health significance. For this purpose, fecal samples were obtained from 58 dogs and 42 cats experiencing diarrhea. Following DNA extraction, the extracted DNA was examined for the occurrence of C. difficile as well as toxigenic strains through the detection of C. difficil

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Meng, X. Q., K. Yamakawa, H. Ogura, and S. Nakamura. "Haemagglutination activity of toxigenic and non-toxigenic strains ofClostridium difficile." FEMS Microbiology Letters 118, no. 1-2 (1994): 141–44. http://dx.doi.org/10.1111/j.1574-6968.1994.tb06816.x.

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Huang, Jianwei, Yumei Zhu, Huixin Wen, et al. "Quadruplex Real-Time PCR Assay for Detection and Identification of Vibrio cholerae O1 and O139 Strains and Determination of Their Toxigenic Potential." Applied and Environmental Microbiology 75, no. 22 (2009): 6981–85. http://dx.doi.org/10.1128/aem.00517-09.

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ABSTRACT Vibrio cholerae is a natural inhabitant of the aquatic environment. However, its toxigenic strains can cause potentially life-threatening diarrhea. A quadruplex real-time PCR assay targeting four genes, the cholera toxin gene (ctxA), the hemolysin gene (hlyA), O1-specific rfb, and O139-specific rfb, was developed for detection and differentiation of O1, O139, and non-O1, non-O139 strains and for prediction of their toxigenic potential. The specificity of the assay was 100% when tested against 70 strains of V. cholerae and 31 strains of non-V. cholerae organisms. The analytical sensiti

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Kruglikov, V. D., N. E. Gaevskaya, E. V. Monakhova, et al. "Analysis of Peculiarities of Epidemiological Situation on Cholera in the World and in the Russian Federation in 2024 and Forecast of its Development in 2025." Problems of Particularly Dangerous Infections, no. 1 (April 4, 2025): 35–47. https://doi.org/10.21055/0370-1069-2025-1-35-47.

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The aim of the work was to analyze the peculiarities of the cholera epidemiological situation in the world and in Russia in 2024; forecast for 2025. The results of proactive epidemiological surveillance showed a continued upward trend in cholera morbidity in the world despite of the decrease in this indicator in 2024 (762 830 cases in 42 countries) as compared to 2023 (816 235 in 47 countries). A special feature was the import of a polyantibiotic-resistant Vibrio cholerae O1 El Tor strain from Tanzania to Island Mayotte. Active labor migration to the Russian Federation (RF) from countries with

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Dissertations / Theses on the topic "Toxigenic strains"

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Daly, Dyan Jennifer. "A study of the distribution of toxigenic and non-toxigenic group II non-proteolytic Clostridium botulinum strains." Thesis, University of Ulster, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.390116.

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Boeira, Lucia Schuch. "Effects of fusariotoxins on the performance of brewing yeast strains." Thesis, Heriot-Watt University, 2000. http://hdl.handle.net/10399/560.

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Hammond, Georgia Ann. "The toxigenic element of Clostridium difficile strain 10463 and its transcriptional analysis in strains which differ in toxigenicity." Diss., Virginia Tech, 1994. http://hdl.handle.net/10919/37447.

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Clostridium difficile is a Gram positive, anaerobic bacterium which produces two potent protein toxins, A and B. The genes for toxins A and B have been previously cloned and sequenced and lie within 1.4 kb of each other. Upstream and downstream boundaries between sequences shared by both toxigenic and nontoxigenic strains and those sequences which are unique to toxigenic strains were established. A toxigenic element was defined in C. difficile strain 10463 which is 19.6 kb in length and is comprised of five open reading frames, including the toxin A and B genes. One of these open reading

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Srimanote, Potjanee. "Analysis of putative virulence factors of a locus of enterocyte effacement-negative shiga-toxigenic Escherichia coli O113:H21 strain." Title page, contents and abstract only, 2003. http://web4.library.adelaide.edu.au/theses/09PH/09php863.pdf.

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"February 2003." Addendum and corrigenda inserted at back Includes bibliographical references (leaves 249-272) Aims to identify and characterise potential virulence-associated factors from the locus of enterocyte effacement-negative shiga-toxigenic Escherichia coli O113:H21 strain 98NK2 which was responsible for an outbreak of haemolytic uremic syndrome. Particular attention was focused on putative virulence genes encoded on the megaplasmid of this strain.

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Ming-YuGuo and 郭明渝. "Phenotypic comparison of Clostridium dificile RT017 strains with other toxigenic strains." Thesis, 2018. http://ndltd.ncl.edu.tw/handle/rn6duz.

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碩士<br>國立成功大學<br>醫學檢驗生物技術學系<br>106<br>Clostridium. difficile causes nosocomial infection worldwide, especially in the patients with long-term usage of broad spectrum antibiotics. Clinical symptoms of C. difficile infections may present as diarrhea and pseudomembranous colitis (PMN). Therefore, controlling of C. difficile infection (CDI) is the most important public-health issues. In the United States and Europe, RT027 was known to be the epidemic and hypertoxigenic clone. However, the different epidemiologic trends in ribotype strain were observed in other continents. In Asia, RT017 is the pred

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Liao, Pei-Hsuan, and 廖佩萱. "Detection of aflatoxin toxigenic strains by using loop-mediated isothermal amplification method." Thesis, 2014. http://ndltd.ncl.edu.tw/handle/14005957233815936969.

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碩士<br>東海大學<br>食品科學系<br>102<br>In Taiwan cereal grain, peanut products and Chinese herbs are liable to fungal contamination, since the subtropical climate is warm and humid. The fungal contamination often causes mycotoxin residues in food materials. Carcinogenic aflatoxin is more serious threatening than any other mycotoxins to human health. The objective of this study is to develop a system for detecting aflatoxin in food materials. Firstly, the loop-mediated isothermal amplification (LAMP) method was used to screen toxigenic strains of Aspergillus flavus and A. parasiticus, then the toxigenic

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Ateba, Collins Njie. "The detection and molecular characterisation of Shiga Toxigenic Escheria coli (STEC) O157 strains from humans, cattle and pigs in the North-West Province, South Africa / Collins Njie Ateba." Thesis, 2006. http://hdl.handle.net/10394/11220.

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The prevalence and antibiotic resistant profiles of shiga-toxin producing Escherichia coli 0157 strains isolated from faeces samples of cattle, pigs and human stool samples were determined. The strains were further characterised by molecular methods for the presence of shiga-toxin virulence genes and antibiotic resistant genes. Seventy-six Escherichia coli 0157 strains were isolated and the prevalence was higher among E. coli isolated from faeces from pigs (44.2% to 50%) than those from cattle faeces (5.4% to 20.0%) or human stool samples (7 .5%). On testing E. coli 0157 isolates for their res

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Books on the topic "Toxigenic strains"

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Daly, Dyan Jennifer. A study of the distribution of toxigenic and non-toxigenic group II non-proteolytic clostridium botulinum strains. The Author], 1996.

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Book chapters on the topic "Toxigenic strains"

1

Logrieco, Antonio, Giuseppina Mule, Antonio Bottalico, Stephen W. Peterson, and Antonio Evidente. "Molecular Genetic Criteria for the Identification of Atypical Toxigenic Fusarium Strains." In Mycotoxins, Wood Decay, Plant Stress, Biocorrosion, and General Biodeterioration. Springer US, 1994. http://dx.doi.org/10.1007/978-1-4757-9450-2_15.

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Cockle, S., G. Zealey, S. Loosmore, et al. "Development of Non-Toxigenic Vaccine Strains of Bordetella pertussis by Gene Replacement." In Advances in Experimental Medicine and Biology. Springer US, 1991. http://dx.doi.org/10.1007/978-1-4684-6000-1_24.

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González-Jaén, M. Teresa, Salvador Mirete, Belén Patiño, Elena López-Errasquín, and Covadonga Vázquez. "Genetic markers for the analysis of variability and for production of specific diagnostic sequences in fumonisin-producing strains of Fusarium verticillioides." In Molecular Diversity and PCR-detection of Toxigenic Fusarium Species and Ochratoxigenic Fungi. Springer Netherlands, 2004. http://dx.doi.org/10.1007/978-1-4020-2285-2_7.

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Odunayo Adejuwon, Adekunle, and Victoria Anatolyivna Tsygankova. "α-Amylase Production by Toxigenic Strains of Aspergillus and Penicillium." In Aflatoxin B1 Occurrence, Detection and Toxicological Effects. IntechOpen, 2020. http://dx.doi.org/10.5772/intechopen.86637.

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Bethell, Delia B., and Tran Tinh Hien. "Diphtheria." In Oxford Textbook of Medicine, edited by Christopher P. Conlon. Oxford University Press, 2020. http://dx.doi.org/10.1093/med/9780198746690.003.0105.

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Diphtheria is a potentially lethal infection caused by toxin-producing strains of Corynebacterium diphtheria, a Gram-positive bacillus. Humans are the only known reservoir, with spread via respiratory droplets or direct contact with skin lesions. Although now rare in developed countries, this vaccine-preventable disease remains an important problem in countries with poor or failing health systems, and is estimated to cause about 5,000 deaths per year worldwide, most in children under 5 years of age. Diphtheria develops when toxigenic bacteria lodge in the upper airway or on the skin of a susce

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Yuan, Jian, and Kyoung-Jin Yoon. "Overview of PCR Methods Applied for the Identification of Freshwater Toxigenic Cyanobacteria." In Cyanobacteria - Recent Advances in Taxonomy, Ecology and Applications [Working Title]. IntechOpen, 2021. http://dx.doi.org/10.5772/intechopen.97701.

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Although cyanobacteria are essential microorganisms on earth, some cyanobacteria produce toxins known as cyanotoxins, threatening humans and animals’ health. Hence, it is imperative to rapidly and accurately identify those toxic cyanobacteria. Unfortunately, traditional microscopic methods have limitations for accurate identification due to the lack of discernable morphological difference between toxic and non-toxic strains within the same cyanobacterial species or genus. In contrast, their genetic profiles are inherently conserved; therefore, nucleic acid-based assays can be more reliable for

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Rodrigues, Mariana Paiva, Tatiana Xavier de Almeida, Águida Aparecida de Oliveira, et al. "SCREENING OF PLANT EXTRACTS ON GROWTH PARAMETERS OF TWO ASPERGILLUS SECTION FLAVI TOXIGENIC STRAINS." In Tecnologia e Microbiologia Sob a Perspectiva da Segurança dos Alimentos. Editora Científica Digital, 2021. http://dx.doi.org/10.37885/210906015.

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Skoufos, I., I. Verginadis, I. Simos, et al. "Attapulgite (Ultrafed®) protective action against E. coli and C. perfringes toxigenic strains in pigs." In Book of Abstracts of the 65th Annual Meeting of the European Association for Animal Production. Brill | Wageningen Academic, 2014. http://dx.doi.org/10.3920/9789086867998_094.

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Schiavo, G. "VAMP-specific botulinum neurotoxins." In Guidebook to Protein Toxins and Their Use in Cell Biology. Oxford University PressOxford, 1997. http://dx.doi.org/10.1093/oso/9780198599555.003.0035.

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Abstract Botulinum neurotoxins (BoNT A-G) are the causative agents of the flaccid paralysis of botulism (Hatheway 1995) and are produced by toxigenic strains of Clostridium botulinum and less frequently Cl. barati and Cl. butyricum (Hall et al. 1985; Aureli et al. 1986). BoNTs are produced as a large complex of 300-900 kDa con¬ taining the neurotoxin (150 kDa) and additional components, such as hemagglutinin (300 kDa) and a nontoxic peptide (Sakaguchi 1983). These additional proteins play a role in the stabilization of the neurotoxins to the gut is activated by proteolysis at an exposed loop,

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Dingle, Tanis C., and Duncan R. MacCannell. "Molecular Strain Typing and Characterisation of Toxigenic Clostridium difficile." In Methods in Microbiology. Elsevier, 2015. http://dx.doi.org/10.1016/bs.mim.2015.07.001.

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Conference papers on the topic "Toxigenic strains"

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Grajdieru, Cristina. "Molecular identification of Aflatoxin-producing aspergillus strains in maize seed-material." In International Scientific Symposium "Plant Protection – Achievements and Prospects". Institute of Genetics, Physiology and Plant Protection, Republic of Moldova, 2020. http://dx.doi.org/10.53040/9789975347204.66.

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Toxigenic fungi are part of soil microbiota and natural inhabitants of agrocenosises and crops. Aflatoxins produced by several Aspergillus species are hazardous biological compounds known as potent carcinogens. Using PCR-based assays, a successful identification of toxigenic A. flavus and A. parasiticus strain was performed. Fungal genome sequences associated with aflatoxin production as target sequences were proved to be effective for identification of toxigenic Aspergillus species.

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Ginting, Ngalo Putri, and Kiki Nurtjahja. "Toxigenic and Non-toxigenic Aspergillus Flavus Strains Isolated from Candlenut (Aleurites Moluccana) in North Sumatera." In The International MIPAnet Conference on Science and Mathematics (IMC-SciMath). SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0010613200002775.

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Yao, Haibo, Zuzana Hruska, Russell Kincaid, Robert L. Brown, Deepak Bhatnagar, and Thomas E. Cleveland. "Utilizing fluorescence hyperspectral imaging to differentiate corn inoculated with toxigenic and atoxigenic fungal strains." In SPIE Defense, Security, and Sensing. SPIE, 2012. http://dx.doi.org/10.1117/12.919580.

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Simanullang, Jesica, and Kiki Nurtjahja. "Fungal Contamination and Toxigenic Aspergillus flavus Strains on Dried Anchovies Sold in North Sumatera." In The International MIPAnet Conference on Science and Mathematics (IMC-SciMath). SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0010613000002775.

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Anidah, Winiati Rahayu, and Siti Nurjanah. "Screening of Toxigenic Aspergillus flavus Strains and Aflatoxin Content from Agricultural Commodities in Indonesia." In ASEAN Food Conference. SCITEPRESS - Science and Technology Publications, 2019. http://dx.doi.org/10.5220/0009981202210226.

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Alasmar, Reem Moath, and Samir Jaoua. "Investigation and Biological Control of Toxigenic Fungi and Mycotoxins in Dairy Cattle Feeds." In Qatar University Annual Research Forum & Exhibition. Qatar University Press, 2020. http://dx.doi.org/10.29117/quarfe.2020.0065.

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Mycotoxins, the secondary fungal metabolites are important contaminants of food and feed. Among the other contaminants, aflatoxin B1 (AFB1) and OTA are frequently detected in the animal feed product. In the present study, the mixed dairy cow feed products were collected from the supermarkets in Qatar and analyzed for the presence of AFB1 and OTA. Yeast strains were isolated and tested for their biological control activities against aflatoxigenic and ochratoxin fungi. We demonstrated that local 15 yeasts isolates have important antifungal potential activities through the synthesis of volatile o

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