Identification and analysis of three correlated foodborne disease outbreaks caused by Vibrio parahaemolyticus in Shunyi, Beijing

ObjectiveTo analyze three foodborne diseases outbreaks caused by Vibrio parahaemolyticu in Shunyi district of Beijing.

MethodsThe epidemiological data, isolated pathogens from suspected contaminated food samples, environment samples and stool samples of diarrheal disease patient of three outbreaks were collected. Isolated V. parahaemolyticus strains were used for the molecular typing by  pulsed-field gel electrophoresis(PFGE). The PFGE patterns were aligned analyzed by using Chinese Pathogen Identification Net (China PIN).

ResultsFifteen V. parahaemolyticus strains(O3: K6, toxR+/tdh+/trh-)were isolated from 12 clinical samples of diarrhea patients and 3 suspected contaminated food samples. The PFGE patterns of the strains were divided into 2 closely related clusters. The patterns in each cluster shared 100% similarity, and the similarity of clusters between 2 patterns was 93.94%. These PFGE patterns of V. parahaemolyticus were not in the clusters detected in Shunyi from 2014 to 2017 according to China PIN.

ConclusionThe 3 foodborne disease outbreaks caused by V. parahaemolyticus had common infection source. China PIN is a powerful tool for the detection and source tracing and correlation analysis of foodborne disease outbreaks.