الفهرس 
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Abstract
A total of 100 samples of bivalve molluscus was subjected for enumeration, isolation and identification of Staphylococcus aureus, total coliforms, faecal coliforms and Escherichia coli. Sixty one strains of S. aureus were isolated, 20 strains from each yellow and black Gandoufly and 21 strains from Om El-Kholoul. While 36 strains of E. coli were isolated 13 strains from yellow Gandoufly, 12 strains from black Gandoufly and 11 strains from Om El-Kholoul. All S. aureus isolates were coagulase positive. The antimicrobial sensitivity test revealed that all the S. aureus isolates were 100% sensitive to rifampicin, vancomycin, cephalexin, cephataxime, chloramphenicol, kanamycin, neomycin, amikacine, spiramicin, gentamicin, ciprofloxacin, enrofoxacin, ofloxacin, oxacillin, cloxacillin, amoxy-clavulinic acid and ampicillin. Mean while they were100% resistant to pefloxacin and flumequine, and 92%to streptomycin. While the E.coli isolates were 100% resistance to ampicillin, amoxicillin and streptomycin, 50% to trimethoprim-sulfamathoxazole, lincomycin, neomycin and pefloxacin. Mean while they were 100% sensitive to ofloxacin, enrofloxacin, gentamicin, spiramicin and amikacin, 93.3, 90, 90, 83.3, 80, 80, 76.6, 63.3 and 60% to cephataxime, cephalexin, amoxy-clavulinic, chloramphenicol, tetracycline, kanamycin, flumequine, ciprofloxacin and erythromycin respectively.