Objective By investigating the outbreak of norovirus infectious diarrhea,the causes and influencing factors of the outbreak were analyzed. Methods Field epidemiological survey was used to investigate the epidemic situation and collect relevant samples to detect norovirus nucleic acid. Results A total of 109 cases were found in the epidemic,with the incidence of 28.1%.The main clinical manifestations were vomiting (98.96%),abdominal pain (75.00%),nausea (68.75%) and diarrhea (28.13%).10 anal swabs and 2 of them were positive for GII norovirus.All the cases were students who participated in the spring outing research activities,and the morbidity rate of senior students was higher than that of junior students.The results of case-control study showed that contact with patients three days before the onset (OR=5.52,95% CI=2.03-15.02) and direct contact with vomitus (OR= 12.62,95% CI=1.2-133.16) were the risk factors for the outbreak,and the use of hand sanitizer or soap (OR=0.15,95% CI= 0.06-0.43) was the protective factor. Conclusion The epidemic was caused by norovirus infection.The effective measures to prevent the outbreak of norovirus in schools included isolation treatment,environmental disinfection,hand hygiene publicity and food safety management.
Key words
Norovirus /
Outbreak /
Infectious diseases /
Health emergency /
School health
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