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Purpose Among the principal microorganisms transmitted to humans by foods of animal origin, Staphylococcus aureus stands out, causing a variety of diseases and with a wide potential for acquiring antimicrobial resistance. This work aimed to determine the prevalence of S. aureus , its multi-drug resistance (MDRSA), and the identification of methicillin-resistant Staphylococcus aureus (MRSA) in retail beef and pork in the state of Tamaulipas, Mexico. Methods S. aureus strains isolated from retail meat were characterized by microbiological and molecular methods to determine phenotypic drug-resistance and detect MRSA strains. Results Of the 106 samples (54 from beef and 52 from pork) from 11 different cities, we detected a prevalence of S. aureus of 44.3% (47/106). A total of 87 S. aureus strains were identified; these presented 54 resistance patterns to different antimicrobials with a high prevalence of MDRSA (85%) and a low prevalence of MRSA strains (3%). Conclusion These results indicate the presence of MDRSA and MRSA in retail beef and pork in Tamaulipas, representing a high risk for consumer health.

Detection of multi-drug resistance and methicillin-resistant Staphylococcus aureus (MRSA) isolates from retail meat in Tamaulipas, Mexico