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Background  There is paucity of information regarding the epidemiology of  Escherichia coli  O157: H7 in developing countries. In this study, we investigated the occurrence of  E. coli  O157: H7 associated with beef cattle at processing plants and at retail shops in Ethiopia.    Methods  Various samples were collected from beef cattle at slaughter/processing plants, carcass at retail shops and humans at health centers.  E. coli  O157: H7 was isolated, identified and characterized for antimicrobial resistance, using standard microbiological methods.    Results  At the processing plants  E. coli  O157: H7 was detected in 1.89% of fecal, 0.81% of intestinal mucosal swab, 0.54% of skin swab and 0.54% of carcass internal swab samples. At retail shops it was detected in 0.8% of carcass and 0.8% of cutting board swab samples, while all samples from utensils, hands from workers, and fecal and stool samples were negative. All isolates were resistant to Amoxicillin, moderately resistant to Cefoxitine and Nitrofurantoins but susceptible to other antimicrobials tested.    Conclusions    E. coli  O157: H7 occurs at low prevalence in beef cattle, and the current sanitary dressing procedures in the processing plants and storage conditions in the retail shops are effective against  E. coli  O157: H7.

Prevalence of Escherichia coli O157:H7 in beef cattle at slaughter and beef carcasses at retail shops in Ethiopia