TITLE

Prevalence of O157:H7 and Non-O157 E. coli in Iranian Domestic Sheep

AUTHOR(S)
Tahamtan, Yahya; Namavari, Mehdi
PUB. DATE
January 2014
SOURCE
Pakistan Journal of Biological Sciences;2014, Vol. 17 Issue 1, p104
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
The aim of the present study was the isolation of both E. coli O157 and non-O157 in sheep. Verotoxins (VT) 1, 2 and eae genes were tested for this propose. Sheep faces are an important source of Shiga toxin-producing Escherichia coli (STEC). Escherichia coli O157:H7 is a highly virulent food-borne pathogen and threat to public health. Rectal swab samples from sheep were collected during 2009-2010. Conventional plating and Polymerase Chain Reaction (PCR) were carried out according to virulence factors (Stx1, Stx2 and eaeA). There significant differences between prevalence of STEC and session were observed. It was at highest in spring and late summer. Six (3.92%) sheep carcasses were contaminated by E. coli 0157:H7.Only six samples were positive by PCR specific for the VT2 gene and produced verocytotoxin VT2, whereas all isolates were negative for the presence of VT1 and eae virulence genes considered. Geographical variations and season may be influenced in the prevalence rate. The composition of the gastrointestinal flora may be changed by different diet and, therefore Ol 57 STEC rate in sheep and lamb was different. Iranian sheep indicated as a natural host of E. coli O157 strains therefore, may be potentially pathogenic for humans. This is the first report of E. coli O157 detection from sheep in Iran.
ACCESSION #
91959813

 

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