الفهرس 
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Abstract
Salmonella is an important pathogen in the food industry and has been frequently identified as etiological agent of food borne outbreak. Poultry is one of the most reservoirs of Salmonella that can be transmitted to humans through the food chain causing high risk bacterial food poisoning. Pathogenesis of Salmonella is depending on a large numbers of factors controlled by an array of genes responsible for the actual virulence of Salmonella .furthermore ,multidrug resistance of Salmonella to commonly used antibiotics is increasing both in veterinary and public health sectors and has emerged as a global problem that lead to treatment failure. In the present study , bacteriological examination of 300samples from broiler internal organs(liver,2ceci,un absorbed yolk sac)from day1old chicks suffering from omphalitis and respiratory disorders after hatching ,revealed 37 Salmonella isolates 12.3%.