[Epidemiological and etiological characteristics of Vibrio parahaemolyticus strains causing foodborne disease outbreaks in Guangdong Province from 2017 to 2020].

Objective: To study the epidemiological and pathogenic characteristics of Vibrio parahaemolyticus isolated from outbreaks cases in Guangdong Province, 2017-2020. Methods: Epidemiological characteristics of 87 outbreak events caused by Vibrio parahaemolyticus were analyzed. Strains were serotyped, and then analyzed by pulsed-field gel electrophoresis (PFGE). Results: The food-borne disease outbreak caused by Vibrio parahaemolyticus was found in 16 cities. 44.8% (39/87) and 37.9% (33/87) of the outbreaks occurred in hotels, restaurants and school canteens, respectively. Improper food processing and storage (40.2%, 35/87) and cross contamination caused by indiscriminate raw and cooked food (25.3%, 22/87) were the main causes of food-borne disease outbreaks of Vibrio parahaemolyticus. The main serotypes of patient derived strains were O3:K6 (87.5%) and O4:KUT (22.5%). The similarity value between O3:K6 type isolates was 65.5%-100.0%, and the PFGE pattern similarity value of O4:KUT type isolates was 66.5%-100.0%. Conclusion: Outbreaks caused by Vibrio parahaemolyticus are widely distributed in Guangdong province. It is necessary to strengthen the publicity and education on the correct handling of food in hotels, restaurants, schools, and unit canteens. O3:K6 and O4:KUT serotypes are the main serotypes of the outbreak. There is genetic diversity among the epidemic strains.目的： 分析2017—2020年广东省副溶血弧菌暴发事件的基本流行病学及病原特征。 方法： 对2017—2020年广东省87起副溶血弧菌暴发事件的基本流行病学特征进行统计分析，对分离株进行血清分型，并运用PFGE进行分子分型。 结果： 广东省副溶血弧菌暴发事件分布在16个地市，44.8%（39/87）和37.9%（33/87）的暴发事件发生在宾馆饭店和学校单位食堂，食品加工存储不当（40.2%，35/87）和生熟不分引起的交叉污染（25.3%，22/87）是引起副溶血弧菌的食源性疾病暴发的主要原因。患者来源菌株主要血清型为O3：K6（87.5%）和O4：KUT（22.5%）。PFGE谱型提示O3：K6型分离株间的相似值为65.5%~100.0%，O4：KUT型分离株的PFGE谱型相似值为66.5%~100.0%。 结论： 2017—2020年广东省副溶血弧菌引起的食源性暴发事件广泛分布，需加强对宾馆、饭店、学校、单位食堂食品正确处理方面的宣传与教育。O3：K6和O4：KUT血清型是暴发事件的主要血清型，流行菌株之间存在遗传多样性。.