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Enterohaemolysin production and verotoxin genes in Escherichia coli strains isolated from neonatal calves in India

Asian Pacific Journal of Tropical Medicine 2009年第4期2卷 1-5页

作者： Diganta Pan Ashok Kumar Bhatia K.N.Bhilegaonkar Department of Microbiology and Immunology College of Veterinary Science and Animal HusbandryMathura-281 001UPIndia Indian Veterinary Research Institute IzatnagarU.P.243122India

Objective:To screened all haemolytic strains of Escherichia coli(***) for the presence of verotoxin genes and speculate the association between enterohaemolysin production and presence of verotoxin ***: A total 176 of *** strains of 64 serogroups isolated from neonatal calves were selected and screened for alpha -haemolysin and enterohaemolysin production on sheep blood agar and 5%washed sheep blood *** types of haemolytic strains were further characterized by PCR for presence of Verotoxin gene(VT1 and VT2) and confirmed by verocell cytotoxicity ***:Among 27 enterohaemolytic positive strains,19(70. 37%) strains were found positive for presence of verotoxins(VTs) gene and verocell cytotoxicity assay. Whereas 34 alpha-haemolysin strains were found negative for *** strains of *** were found VTs negative but Ehx ***:The close association between enterohaemolysin production and presence of verotoxin genes makes it useful epidemiological marker for rapid screening of Verotoxic *** but this phenotypic marker for screening of verotoxigenic Escherichia coli(VTEC) alone may raise a question in animal.

关键词： Enterohaemolysin Alpha haemolysin verotoxigenic Escherichia coli Calves India

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A Compendium of Shigatoxigenic <i>Escherichia coli</i>: Origins, Bacteriological and Clinical Data on the Serogroups, Serotypes and Untypeable Strains of <i>E. coli</i>Reported between 1980 and 2017, Excluding O157:H7

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Advances in Microbiology 2019年第11期9卷 905-909页

作者： Karl A.Bettelheim Paul N.Goldwater Adelaide Medical School University of AdelaideAdelaideAustralia

The purpose of this paper was to create a compendium of serogroups, serotypes and untypeable strains of Shigatoxigenic/verotoxigenic (STEC/VTEC) Escherichia coli. The compendium includes the origins, bacteriological and clinical data on this important group of microbes. The collection of STEC/VTEC data extends from 1980 to 2017, and excludes STEC/VTEC O157:H7. A total of 499 papers were discovered and documented to create the compendium which includes all the serogroups and serotypes beginning with serogroup O1 through to serogroup O211 and includes O non-typeable strains and ill-defined strains including serotype O"54071":H7. The paper summarises the findings of 8010 E. coli isolates and includes all details including source (human or animal), and clinical condition/disease, serogroup and serotypes, country of origin, year reported, and the author(s) with cited references. Some twenty clinical conditions were shown in association with 4320 serotypes/and untypeable strains. The compendium is a record of an important group of STEC/ VTEC and should provide a useful resource for both researchers and clinicians.

关键词： Shigatoxigenic Escherichia coli verotoxigenic Escherichia coli STEC VTEC Human Disease Animal Disease

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