الفهرس 
Title : Effect of some pathogenic agents on the performance of poultry farms and their control
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Abstract
The aim of this study is: To investigate the contamination of poultry farms with E. coli and Salmonella species. To evaluate the degree of biosecurity level in some broiler poultry farms with especial reference for E. coli and Salmonella Spp. As well as tried to explain the expected causes and risk factors that leads to spread them in poultry flocks in Egypt. To determine E. coli and Salmonella isolates sensitivity for most common used disinfectant and antimicrobial agents in Egypt. A total of 10 broiler farms were studied from November 2016 to January 2018.The farms were visited at different ages (one day old, 7 days, 2week, 4week and 6week of age). The visited farms were described for their construction, bird type, stocking densities, traffic control, pest control, vaccination programmes, disinfection and other managemental criteria. The evaluation process was carried out through filling out a designed questionnaire and taking samples for the isolation of bacterial pathogens. The obtained results showed that 44 E. coli species were isolated from 10 broiler poultry houses (27%);(11%) and (7%) from cloacal swab; Liver and litter, respectively Mean prevalence of E.coli spp. was (52%),(25%) and (35.9%) respectively in open broiler houses whether raised Cobb, Ross or Sasso breeds. The incidence of E. coli in one day old living diseased chicks, 1week, 2week, 4week and 6 weeks of age were;10% ,14% 12%,5.7% and 10.1%, respectively. The most commonly detected E. coli serogroups serotyped were; O78 (31.81%), O2: H6 (18.18), O1: H7 (15.9), O91: H21(11.36),O128 : H2 (9.09), O26: H11(4.54) O146: H21.The percentage of isolated E. coli serotypes O124, O44: H18 and O153 : H2 was 2.27%