양식 굴(Crassostrea gigas)에서 분리된 장염비브리오균의독소 유전자 보유 및 항균제 감수성 = Virulence Factors and Antimicrobial Susceptibility of Vibrio parahaemolyticus isolated from the Oyster Crassostrea gigas

다국어 초록 (Multilingual Abstract)

This study investigated the prevalence of Vibrio parahaemolyticus in the oyster Crassostrea gigas, which is commonly consumed raw. The presence of virulence factors and the antimicrobial susceptibility of isolates were also investigated. The overall prevalence rate of V. parahaemolyticus in oysters was 37.5% (36/96) and the range of concentrations was 30–11,000 MPN/100 g. PCR-based assays indicated that 9.6% (11/115) of the isolates were positive for the thermostable direct hemolysin-related hemolysin gene (trh), while none of the isolates were positive for the thermostable direct hemolysin gene (tdh). The Multiple Antibiotics Resistance (MAR) index was measured for 16 common antimicrobial agents and 46.1% (53/115) of the isolates had a MAR index > 0.2. The MAR index ranged from 0.07 to 0.73. The highest MAR index was observed with strain s150608, isolated in June 2015, which exhibited resistance to 11 antimicrobial agents. Our results demonstrate that oysters are high-risk sources of V. parahaemolyticus, although no antimicrobial agent was being used to promote growth or to treat bacterial infections in the sampled oyster-growing areas.

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