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Salmonella  is a leading cause of foodborne disease and is often associated with the consumption of foods of animal origin. In this study, sixty-six  Salmonella  isolates were obtained from 631 raw meat samples purchased at small retail suppliers in Hubei Province, China. The most prevalent  Salmonella  serotypes were Thompson (18.2%) and Agona (13.6%). Frequent antimicrobial resistance was observed for the sulfonamides (43.9%), tetracycline (43.9%), and the β-lactams amoxicillin and ampicillin (36.4% for each). Interestingly, a high incidence of resistance to cephazolin was observed in strains of the most common serotype,  S.  Thompson. Class I integrons were found in 27.3% (18/66) of the isolates and five of these integrons contained different gene cassettes ( aacA4C-arr-3-dfr2, dfrA12-aadA21, aadA2, dfrA12-aadA2, dfr17-aadA5 ). Additional antimicrobial resistance genes, including  bla  TEM–1 ,  bla  CTX–M–65 ,  bla  CTX–M–15 ,  qnrB , and  qnrS , were also identified among these  Salmonella  isolates. Results of replicon typing and conjugation experiments revealed that an integron with  qnrB  and  bla  CTX–M–15  genes was present on incH12 mobile plasmid in  S.  Thompson strain. Multilocus sequence typing (MLST) analysis revealed 32 sequence types, indicating that these isolates were phenotypically and genetically diverse, among which ST26 (18.2%) and ST541 (12.1%) were the predominant sequence types. The integrons, along with multiple antimicrobial resistance genes on mobile plasmids, are likely contributors to the dissemination of multidrug resistance in  Salmonella .

Incidence and Characterization of Salmonella Isolates From Raw Meat Products Sold at Small Markets in Hubei Province, China