الفهرس 
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Abstract
In this study, the problem of biofilm producing bacteria in different types of poultry farms and their slaughterhouses was investigated for a final purpose to test the efficacy and suggest the suitable regime of some popular disinfectant to control it. For this purpose, a total of 440 samples of cloacal swabs, litter, feeders, water of drinkers, swabs from eggshell and worker̛̛ s hands were collected aseptically from the investigated broiler and layer farms. Besides, 100 samples of washing water, swabs from knifes, tables, eviscerated carcass and worker’s hands were collected from two different poultry slaughterhouses at Sharkia governorate during the period from July 2021 till August 2022.
All the collected samples were examined bacteriologically for isolation and identification of Salmonella spp, E. coli and Staph. aureus. In addition, the representative isolates of Salmonella and E. coli were serotyped. Furthermore, evaluation of biofilm production ability of recovered Salmonella, E. coli and Staph. aureus was performed. Finally, to control the isolated biofilm producing bacteria from investigated poultry farms and poultry slaughterhouses, the efficacy of five modern chemical disinfectants (sodium hypochlorite, H2O2, virkon S, glutaraldehyde and CuSO4) on recovered bacteria was assessed.