Survey of a diarrhea outbreak caused by norovirus in a nursery school

Objective To investigate a diarrhea outbreak caused by norovirus,and find the reason of outbreak in a nursery school. Methods Field epidemiology method was used to analyze the basic situation of the nursery school as well as the epidemiology situation of disease and the laboratory test results. Results A total of17 cases were found,including 15 children and 2 teachers. the attack rate of this nursery school was 4. 86%( 17/350). Detected anal swab 3 samples,faeces 4 samples,vomitus 2 samples,9 specimens of cases were norovirus positive,while 2 specimens of health children were norovirus negative. Collected 2 batches of left bottled water,among which total number of colonies and coliforms were exceeding standard in several water samples( 5 /7). Conclusions Field epidemiology survey and laboratory results indicate that the event is an infectious diarrhea outbreak caused by norovirus.