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Staphylococcus aureus  is one of the most common causes of seafood-borne diseases worldwide, which are attributable to the contamination of food by preformed enterotoxins. In this study, a total of 206 (34.3%)  Staphylococcus aureus  strains were obtained from 600 fish and shrimp samples and were tested for their antimicrobial susceptibility. We assessed the prevalence of the genes responsible for the staphylococcal enterotoxins (SEA, SEB) and toxic shock syndrome toxin 1 (TSST-1) genes. The results indicated that 34% of aqua food samples were contaminated with  S. aureus , and 23.8% of these isolates were  mec-A -positive. Sixty-four percent of the strains isolated from contaminated seafood was enterotoxigenic  S. aureus , and 28.2% of SEs were MRSA-positive. The most prevalent genotype was characterized by the presence of the  sea  gene (45.2%), followed by the  seb  gene (18.5%), and the  tst  gene encoding TSST-1 was found in eight strains (3.9%). Of the 206  S. aureus  isolates, 189 strains (84.9%) were resistant to at least one antibiotic. Given the frequent outbreaks of enterotoxigenic MRSA, it is necessary to make revisions to mandatory programmes to facilitate improved hygiene practices during fishing, aquaculture, processing, and sales to prevent the contamination of fishery products in Iran.

Characterization of Toxin Genes and Antimicrobial Susceptibility of Staphylococcus aureus Isolates in Fishery Products in Iran