Prevalence of virulence genes of Escherichia coli O157:H7/NM isolated from the feces of water buffaloes, camels, cattle, sheep and goats in Iran
2012
Rahimi, E.
The prevalence of Escherichia coli O157:H7/NM was investigated in 327 fecal samples collected from apparently healthy water buffaloes (43), camels (40), cattle (103), sheep (86), and goats (55) in Isfahan, Chaharmahal and Bakhtyari, and Khuzestan provinces of Iran, between August 2010 and February 2011. Overall, 25 of 327 fecal samples (7.6%) were found to be contaminated with E. coli O157. The highest prevalence of E.coli O157 was found in the water buffalo (18.6%), followed by cattle (11.7%), sheep (4.7%), and the goat (1.8%). E.coli O157 was not isolated from camel fecal samples. Of 25 E.coli O157 isolates, 7 were serotype O157:H7 and 18 were serotype O157:NM. Five of the O157:H7 were isolated from the water buffalo and 2 were from cattle feces. All of the E. coli O157:H7 isolates were positive for eaeA, ehlyA and stx1 and stx2, except one isolate that was ehlyA negative. The highest prevalence of E.coli O157 occurred in summer (16.7%) followed by fall (6.3%). The results of this study show that cattle and buffaloes can be a significant source of human infection with enterohemorrhagic E.coli O157 serotype in Iran.
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