Epidemiological investigation of a foodborne disease outbreak caused by Vibro parahaemolyticus

Objective To investigate a foodborne disease outbreak and identify the pathogenic factors in order to prevent the occurrence of similar incidents.

Methods Epidemiological study， on-site food hygiene investigation， and laboratory testing were used to analyze the cause of outbreak in Company A.

Results A total of 24 confirmed cases were screened out. The major clinical symptoms were diarrhea （100.0%）， stomachache （100.0%）， and vomiting （41.7%）. Samples from 24 patients were tested positive for Vibrio parahaemolyticus， and were homologous by Pulsed field gel electrophoresis （PFGE） phylogenetic study. According to the result of case-control study， eating glass noodles salad at the dinner and supper on July 16th， 2019 was the risk factor （OR=15.71，95%CI：1.90‒129.71）.

Conclusion This foodborne disease outbreak was caused by glass noodles salad cross contaminated with Vibrio parahaemolyticus.