الفهرس 
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Abstract
75 poultry farms in Sharkia governorate were investigated during the period from December 2011 till September 2012 for determination of the prevalence of multidrug resistant bacteria (E.coli and Salmonella). The isolated E.coli and Salmonella were serotyped and the occurrence of some antibiotic resistance genes was recorded. On the other aspect, residues of antibiotics used in these farms were determined. The obtained results were summarized under the follows:
1- The prevalence of E.coli isolated from broiler farms was 85.9, 64 and 87.5% in litter, water and bird dropping samples, respectively while it was 81.8, 72.7 and 90.9 %, respectively in layer farms with a total percent of 79.1% in broiler and 81.8% in layer farms.
2- Regarding, the prevalence of Salmonella in broiler farms it was 6.2, and 3.1% in litter and bird dropping samples, respectively while it was 18.1 and 9% in layer farms, respectively with a total percent of 3.1% and 9% in broiler and layer farms, respectively. Meanwhile, no Salmonella was isolated from water samples of poultry farms.
3- Concerning, the serotypes of E. coli recovered from broiler and layer farms. It is clear that, the most predominant serotypes of E. coli from broiler farms were O125:K70 and O142:K86, O86:K71, O119:K69, O126:K71 O91: K-, O78:K80 O127:K63, O25:K11 and O124:K72 while the most predominant serotypes of E. coli from layer farms were O125:K70 O127:K63, O142:K86, O78:K80. Whereas, Salmonella serotypes recovered from broiler and layer farms were S.enteritedis and S. Emek.