Investigation and analysis of a report of an outbreak of influenza A in a primary school in Xuhui District
Objective:To analyze the causes of the outbreak of influenza A in order to control the epidemic situation as soon as possible,find out the pathogen and transmission route,explore scientific and effective countermeasures,provide experience for the treatment of infectious disease outbreaks in schools,and prevent similar incidents in the future.Methods:The case search was carried out according to the case definition,and descriptive epidemiology was used for analysis,and description the three distributions.Four cases of respiratory tract samples were collected on the spot and detected by fluorescence quantitative RT-PCR for viral nucleic acid.Results:A total of 77 influenza-like cases were reported,and 63 confirmed cases were distributed in 16 classes,with an attack rate of 7.69%.Among them,the number of cases in Grade 3 Class 2 had 20 cases at most,which showed obvious clustering.The prevalence rates of boys and girls were 8.21%and 7.69%,respectively,and the difference was not statistically significant(P=0.05).There was statistically significant difference in incidence rate among different age groups(χ2=19.99,P＜0.05).Virus nucleic acid detection of throat swab samples collected from 4 cases showed that 3 samples were positive for H1N1 influenza virus and 1 sample was positive for H3N2.Conclusion:The investigation combined with epidemiology shows that this is a cluster outbreak of influenza A.The investigation results shows that reason for the outbreak is the low vaccination rate in the students and the untimely disinfection of school classes.It is suggested to strengthen the standard operation ability of disinfection in schools,educate parents and students about disease prevention,and improve teachers'and students'awareness and ability of health protection.
influenza A virusoutbreakprimary schoolinvestigation of epidemic situation
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