An outbreak of infectious diarrhea caused by norovirus at a middle school in Jianshui County,2022
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.
万方数据
维普
