الفهرس 
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Abstract
A total of 135 samples were collected from floor, knives, washing water, surfaces of carcass and worker’s hand ( 9 for each) from three different slaughterhouses : (Zagazig , Menia El-Kamah and Abu-hammad) ,Sharkia Governorate during a period from September 2014 till January 2015 .
All the collected samples were examined bacteriologically to determine the prevalence of E.coli and other enterobacteriacae In addition to determine some virulence gene in isolated E.coli as well as antimicrobial sensitivity and efficacy of some disinfectants on isolated E.coli. The obtained result were summarized as follow: 1- The prevalence of E.coli isolated from examined samples was 55.5%, 33.3% and 44.4% for floor, knives,washing water , respectively at Zagazig slaughterhouse. Also, the prevalence of E.coli in examined samples of floor, knives and washing water from Menia El-Kamah slaughterhouse was 33.3%, 22.2% and 11.2%, respectively. Meanwhile , it was 44.4%, 33.3% and 22.2% from Abu- Hammad in case of floor, knives and washing water, respectively. 2- The prevalence of isolated E.coli in examined surfaces of carcasses and worker’s hands was ( 44.4% and 44.4%),(11.1% and 22.2%) and(33.3% and 33.3) for Zagazig , Menia El-Kamah and Abu –Hammad slaughterhouses , respectively.