Analysis of pathogen surveillance and characteristics of foodborne disease outbreaks in a district of Chengdu:2016-2023
Objective To understand the epidemic status,characteristics,and patterns of foodborne diseases in a district of Chengdu,providing a basis for prevention and control measures and food safety assurance.Methods Comprehensive analy-sis of pathogen surveillance data from two sentinel hospitals and emergency response data for foodborne disease outbreaks in the district from January 2016 to August 2023 were carried out.Results A total of 4 208 samples were collected,including 1 894 male and 2 314 female samples.Of these,109 samples tested positive,with 103 positive for Salmonella,2 for Shi-gella,and 4 for Vibrio parahaemolyticus.The monthly positive detection rate for Salmonella varied significantly(x2=52.01,P＜0.001),with more cases from May to August,fewer from December and January to March.There were no significant differences in the monthly positive rates for Vibrio parahaemolyticus,Shigella,and enteropathogenic E.coli(P＞0.05).The positive rate for Salmonella also varied significantly across age groups(x2=22.42,P=0.003),being highest in those aged 70 and above(6.59％)and lowest in those aged 20-29(1.04％).No significant differences were found in the positive rates for Vibrio parahaemolyticus,Shigella,and enteropathogenic E.coli across age groups(P＞0.05).A total of 97 suspected foodborne disease outbreaks were reported and handled,with 22 confirmed cases,including 13 caused by consumption of Salmonella-contaminated preserved eggs.Conclusion Salmonella is the main pathogen cau-sing foodborne diseases in a district of Chengdu,with preserved eggs identified as a high-risk food.Relevant departments are advised to strengthen food safety supervision during the summer,conduct risk assessments,and strengthen food safety awareness to protect public health.
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