Antimicrobial susceptibility and serotyping of Listeria monocytogenes isolated from ready-to-eat seafood and food processing environments in Korea
2017
Lee, D.Y., Food Analysis Center, Korea Food Research Institute, Seongnam, Republic of korea | Ha, J.H., World Institute of Kimchi, Gwangju, Republic of Korea | Lee, M.K., Korea Food Research Institute, Seongnam, Republic of Korea | Cho, Y.S., Food Analysis Center, Korea Food Research Institute, Seongnam, Republic of korea
We examined antimicrobial susceptibility and serotypes of 33 L. monocytogenes isolates collected from ready-to-eat seafood and food processing environments. The isolated strains belonged to the 1/2b (73%), 4b (15%), and 1/2a (12%) serotypes; 11 of the obtained environmental swab samples belonged to the 1/2b serogroup. Antimicrobial resistance to benzyl penicillin (100%), clindamycin (100%), oxacillin (100%), ampicillin (97%), and tetracycline (18%) was detected, and 27/33 isolates (82%) showed resistance to four antibiotics and 6/33 (18%) were resistant to five. Total typing by automated repetitive sequence-based PCR revealed that the 33 isolates grouped into four distinct clusters with significantly correlated serotypes. These findings provide important information about the safety of ready-to-eat seafood and suggest that control measures should be adopted in order to mitigate the risk to humans posed by L. monocytogenes contaminated seafood.
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