Molecular typing on Vibrio parahaemolyticus isolates from Hangzhou, China, during 2000-2002.
- Author:
Wei ZHANG
1
;
Jin-cao PAN
;
Dong-mei MENG
;
Kun CHEN
Author Information
- Publication Type:Journal Article
- MeSH: China; epidemiology; DNA, Bacterial; analysis; Disease Outbreaks; Food Contamination; Foodborne Diseases; Humans; Molecular Epidemiology; Polymerase Chain Reaction; Seafood; Vibrio parahaemolyticus; genetics; isolation & purification
- From: Chinese Journal of Epidemiology 2006;27(4):343-346
- CountryChina
- Language:Chinese
-
Abstract:
OBJECTIVETo study the molecular epidemiology of Vibrio parahaemolyticus isolates from clinical and environmental samples collected in Hangzhou area during 2000 and 2002.
METHODSV. parahaemolyticus isolates from food-poisoning, sporadic diarrhea patients and seafood in market in Hangzhou during 2000 and 2002 were serotyped. From clinical isolates of serotype O3:K6 and environmental isolates of serotype O3:KUT, virulence genes, tdh and trh, were examined by PCR. Molecular typings [including ribotyping, random amplified polymorphic DNA analysis (RAPD), enterobacterial repetitive intergenic consensus PCR (ERIC-PCR)], were also performed.
RESULTSAmong 13 food-poisoning outbreaks caused by V. parahaemolyticus, O3:K6 strains with tdh positive and trh negative were detected in 11 episodes (84.6%), and O4:K8 strains with tdh positive and trh negative were responsible for other 2 outbreaks (15.4%). In 34 V. parahaemolyticus isolates from sporadic diarrhea patients, O3:K6, O4:K8, and O1:KUT strains with tdh positive and trh negative were detected with proportions of 26.5% (9/34), 17.6% (6/34), and 38.2% (13/34), respectively, and other 6 strains were not able to be serotyped. Of 64 isolates from seafood in which both tdh and trh were negative except trh was positive in one O1:KUT strain, 37 belonged to 7 serotypes except O3:K6 or O4:K8, and 9 were not able to be serotyped. The fingprintings of ribotyping, ERIC-PCR, and RAPD showed that almost all of O3:K6 isolates from food-poisoning and sporadic diarrhea patients were genetically close to each other and there were obviously genetical difference between O3:K6 isolates from clinic and O3:KUT isolates from environment.
CONCLUSIONThere was a distinct serotype distribution between V. parahaemolyticus isolates from clinic patients and seafood. One group of close related V. parahaemolyticus O3:K6 strains with tdh positive and trh negative seemed to be prevailing in Hangzhou in those years.