الفهرس 
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Abstract
A total of one hundred and twenty samples of chilled whole chicken carcasses, cut-up parts (breast & thigh) and frozen mechanically separated chicken meat (MSC) (Fifteen samples for each) were collected from Giza traditional shops not applying HACCP system (group A) and from supermarkets selling products produced in poultry processing plant applying HACCP system (group B). These samples were subjected for determination of deterioration criteria, bacteriological examinations and the isolated strains were exposed to antibiotics sensitivity test. The obtained results concerning deterioration criteria revealed that the mean pH values and TVBN of only MSC samples collected from the source A were significantly higher than those collected from the source (B). Moreover, mean TBA values of all samples collected from the source (A) were significantly higher than those collected from the source (B) except whole chicken carcass which non significantly differ. It is obvious from these findings that MSC collected from the sources (A) and (B) were nearly deteriorated while other samples still acceptable. Data of bacteriological examination showed that all investigated bacterial count (total mesophilic, total psychrotrophic, total anaerobic bacterial count, Coliforms and Fecal Coliforms) of all samples collected from the source (A) were significantly higher than that obtained from the source (B) except Fecal Coliforms of MSC samples which is non significantly differ. It also clear that most of investigated bacterial counts of whole chicken carcass and cut up parts collected from the source (A) exceeded the limit described by E.S (1651/2005) and bacterial counts of MSC collected from both the sources (A) and (B) were higher than the permissible limit described by E.S (4178/2005). E. coli poly II O127:K63 was isolated from whole chicken carcasses and thigh samples and E. coli poly I O26:K60 was isolated from MSC collected from the source (A) with incidence rate of 13.33, 13.33 and 20%, respectively. On the other hand, S. Infantis was isolated only from MSC collected from the source (A) with incidence rate of 20%. However, E. coli and Salmonella failed to be isolated from samples collected from the source (B). This indicates that the production of all samples which collected from the source (B) were prepared under good sanitary measures and the HACCP system application was very effective and produce highly safe products .The isolated E. coli strains are sensitive to amoxacillin clavulenic, piperecillin-tazobactam, ceftriaxone, ceftazidme, cefepime, imipenem, aztreonam, gentamycin and amikacin and resistant to ciprofloxacin, co-trimoxazole, chloramphenicol and tetracycline. Meanwhile, the isolated Salmonella Infantis is sensitive to cefotaxime and ciprofloxacin and resistant to ampicillin, co-trimoxazole and chloramphenicol.