In the present study, a total of 96 isolates (Salmonella spp. 32, Escherichia coli 32 and Staphylococcus aureus 32) from various foods in South China were investigated for antibiotic susceptibility, class 1 integron, and biofilm formation ability. According to the results, 61.5% of the isolates were resistant to at least one type of tested antibiotics, with 17.7% strains exhibiting multidrug resistance, and 44.8% had weak or intermediate abilities of biofilm formation. One foodborne vancomycin resistant S. aureus was strikingly found in our study, which, to our knowledge, was the first report. Class 1 integrons were tested in 31.3% of the isolates, including four S. aureus strains, which was the first evidence of class 1 integron from foodborne S. aureus strains. Pearson’s Chi-square test was applied to analyze the antimicrobial susceptibilities between isolates with ability and inability of biofilm formation for 18 class 1 integron-positive Salmonella spp., and statistically significant difference was only observed for cefazolin and gentamicin, which was the first report on phenotypic correlation existing among the aspects of antibiotic susceptibility, class 1 integron and biofilm formation ability. In conclusion, this novel finding may offer significant guidance in effective control on dissemination of antibiotic resistance of foodborne pathogens.

Investigation of antibiotic susceptibility, class 1 integron and biofilm formation ability on Salmonella spp., Escherichia coli and Staphylococcus aureus from various foods in South China

254th National Meeting (2017)

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