الفهرس 
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Abstract
This study aimed to examine the prevalence and antimicrobial susceptibility of Pseudomonas spp. in two common Egyptian marine fish species. It also examined the prevalence of S. aureus, their ability to produce enterotoxins, and antimicrobial susceptibility of S. aureus. Materials and methods: 100 marine water fish samples, including 50 P. Pagrus fish and 50 Saurida undosquamis, were randomly purchased and examined in a laboratory under possible aseptic conditions without undue delay and examined bacteriologically to isolate and identify Pseudomonas spp., and S. aureus. Results: The prevalence rates of Pseudomonas spp. were 32% and 20% in P. Pagrus fish and 20% in Saurida undosquamis, respectively. The virulence-associated genes were lasB (Elastase B gene), exoS (Exoenzyme S) and pilB (pili gene) were detected in the recovered P. aeruginosa at 100%, 71.4%, and 28.6%, respectively. The recovered Pseudomonas species had high antimicrobial resistance to erythromycin, amoxicillin, ampicillin, and gentamycin. Staphylococcus aureus, a major cause of foodborne intoxication, was found in Saurida undosquamis and P. Pagrus fish. The bacteria showed resistance to kanamycin, clindamycin, nalidixic acid, and sulphamethoxazole 100%, 87.9%, 84.8% respectively.
Conclusion: The study found that P. Pagrus fish and Saurida undosquamis are potential sources of Pseudomonas spp., particularly multidrug-resistant P. aeruginosa, and enterotoxigenic multidrug-resistant S. aureus.