Epidemiological investigation of an outbreak of norovirus infectious diarrhea in Jinghong City of Xishuangbanna Prefecture
Objective To investigate and analyze an outbreak caused by Norovirus infection in Jinghong City,and provide reference for the prevention and treatment of Norovirus infection in Yunnan Province.Methods The epidemiological characteristics and clinical manifestations were collected by conducting questionnaires and face-to-face interviews to patients and related persons who developed symptoms from April 22 to May 3,2023.Descriptive epidemiological methods were used to describe the time,population,and spatial distribution of the cases.Conduct on-site hygiene investigation on a restaurant in a scenic area where the patient dined,including the health status of employees,dining environment,and water supply equipment.Collect cases,travel group tourists,catering staff anal swabs,suspicious water samples,surface coating of objects,and food samples for laboratory testing using a microbial rapid enrichment system.Results A total of 186 cases were found that met the case definition,distributed among 22 travel groups.There were 44 males and 142 females,with a male-to-female ratio of 1∶3.23,and the minimum age was 6 years and the maximum age was 78 years.Four staff members and their families of a restaurant in a certain scenic area had suffered from diarrhea and vomiting in the past week.Fly prevention facilities were found on site but were not activated for use.There was no light tube on the ultraviolet disinfection lamp in the fruit room.The water intake point in the scenic area was very close to the sewage discharge point and located downstream of the sewage discharge point.Out of 346 anal swab samples collected,85 were positive for norovirus.Conclusion This incident is an outbreak of infectious diarrhea caused by Norovirus contamination of a water source,which was caused by Norovirus contamination of a self-provided domestic water source in a certain scenic area.It is recommended to strengthen the diagnosis,treatment,and isolation of cases,promptly carry out water source disinfection,suspend the operation of restaurants in the scenic area,and carry out public health propaganda through multiple channels and platforms to prevent the spread and recurrence of the epidemic.
NorovirusOutbreak of epidemicEpidemiological characteristics
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