An outbreak of infectious diarrhea caused by norovirus at a middle school in Jianshui County, 2022
SU Weiwei1, MIN Xiangdong1, LIU Chunyan1, YANG Zushun1, WANG Weijia2, MOU Jianchun2, JIANG Hongcheng3, LIU Zhitao1, LI Juanjuan1
1. Yunnan Provincial Center for Disease Control and Prevention, Kunming, Yunnan 650022, China; 2. Honghe Prefecture Center for Disease Control and Prevention, Honghe, Yunnan 661100, China; 3. Jianshui County Center for Disease Control and Prevention, Jianshui, Yunnan 654300, China
Abstract：Objective To identify the causes and pathogenic factors of an outbreak of infectious diarrhea in a middle school in a town of Jianshui County in 2021. Methods Descriptive epidemiological methods were used to describe the clinical manifestations and spatial, temporal and population distribution of the cases. We searched for suspected foods with pathogenic bacteria combined with the results of case-control studies. On-site hygienic investigation was carried out, and case specimens, samples of domestic water, drinking water and food, and smeared samples of food processing tools were collected for norovirus PCR detection and gene sequencing. Results A total of 263 cases were found. The main symptoms were diarrhea (83.65%), abdominal pain (78.33%), nausea (68.44%) and vomiting (65.02%). The results of field epidemiological investigation revealed that 4 water samples from the reservoir on the roof of student dormitory and 1 sample from the reservoir on the roof of teaching building were positive for norovirus nucleic acid. Meanwhile, water from Laohongshan Reservoir was found to be directly supplied to the school without disinfection. The cases' distribution range was consistent with the water range within the school supplied by Laohongshan Reservoir. 31 cases were tested positive for norovirus nucleic acid. Conclusion This is an outbreak of infectious diarrhea caused by norovirus contamination of school water supply, suggesting that water source management, school water sanitation management, secondary water supply supervision and hygienic monitoring should be strengthened, and well water and river water which have not been strictly disinfected are prohibited to use as domestic water.
苏玮玮, 闵向东, 刘春燕, 杨祖顺, 王维佳, 牟建春, 蒋红成, 刘志涛, 李娟娟. 2022年建水县某中学一起诺如病毒感染性腹泻暴发疫情的调查[J]. 实用预防医学, 2024, 31(4): 449-453.
SU Weiwei, MIN Xiangdong, LIU Chunyan, YANG Zushun, WANG Weijia, MOU Jianchun, JIANG Hongcheng, LIU Zhitao, LI Juanjuan. An outbreak of infectious diarrhea caused by norovirus at a middle school in Jianshui County, 2022. , 2024, 31(4): 449-453.
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2024, Vol. 31 
