Molecular typing of Vibrio parahaemolyticus isolates from the middle-east coastline of China.
The occurrence of outbreaks of Vibrio parahaemolyticus gastroenteritis in China highlights the need for strain characterization and subtyping of this pathogenic species. A total of 56 epidemiologically-unrelated strains of V. parahaemolyticus were isolated from clinical samples, seafood and various environmental sites in the middle-east coastline of China from 2006 to 2008. The isolates were characterized using four molecular typing methods, including ribotyping, enterobacterial repetitive intergenic consensus sequence PCR (ERIC-PCR), pulsed-field gel electrophoresis (PFGE), and sequence analysis of the gyrB gene. Genetic profiles of cluster analysis from these molecular typing tests clearly showed that there were differences in potential pathogenicity among isolates from seafood and its environments. Genetic characterization of two isolates (F13 and QS2) that originated from seafood demonstrated that they were potentially pathogenic. Discriminatory indices of four typing methods for the 56 V. parahaemolyticus isolates were differentiated by Simpson's Index of Diversity. The discriminatory index of ERIC-PCR typing was maximal (D=0.942), while that of sequence analysis of the gyrB gene was minimal (D=0.702). The discriminatory ability was greatly enhanced (D=0.966) when ERIC-PCR was coupled with sequence analysis of the gyrB gene. These results suggest that ERIC-PCR combined with sequence analysis of gyrB gene may be a reliable, rapid typing strategy for V. parahaemolyticus strains.
MOST-USDA Joint Research Center for Food Safety & Bor Luh Food Safety Center, School of Agriculture & Biology, Shanghai Jiao Tong University, 800 Dongchuan Rd., Shanghai 200240, China.
Wanyi
W
Chen
Yanping
Y
Xie
Jingye
J
Xu
Qingzhong
Q
Wang
Ming
M
Gu
Jielin
J
Yang
Min
M
Zhou
Dapeng
D
Wang
Chunlei
C
Shi
Xianming
X
Shi
D015373:Bacterial Typing Techniques / Q000379:methods; D002681:China; D027081:DNA Gyrase / Q000235:genetics; D017931:DNA Primers / Q000235:genetics; D004269:DNA, Bacterial / Q000032:analysis; D021901:DNA, Intergenic; D016521:Electrophoresis, Gel, Pulsed-Field / Q000379:methods; D004784:Environmental Monitoring; D058889:Molecular Typing; D016133:Polymerase Chain Reaction / Q000379:methods; D021521:Ribotyping; D017747:Seafood / Q000382:microbiology*; D012623:Seawater / Q000382:microbiology; D017422:Sequence Analysis, DNA; D014736:Vibrio parahaemolyticus / Q000145:classification* / Q000235:genetics* / Q000302:isolation & purification; D014871:Water Microbiology
D017931:DNA Primers; D004269:DNA, Bacterial; D021901:DNA, Intergenic; D027081:DNA Gyrase