Analysis on characteristics of influenza outbreaks in Hedong District of Tianjin City from 2013 to 2022
Objective To analyze the epidemiological characteristics of influenza-like outbreaks in Hedong District of Tianjin City from 2013 to 2022,and provide a scientific basis for formulating influenza outbreak prevention and control strategies.Methods The relevant data of dealing with influenza outbreaks in Hedong District of Tianjin City from 2013 to 2022 were collected and data were analyzed.Results From 2013 to 2022,a total number of 15 influenza outbreaks were reported in Hedong District of Tianjin City,with a cumulative reported incidence of 372 cases and a cumulative reported attack rate of 2.09％.The outbreaks mainly occurred in winter and spring seasons(November,December and next March).All of the outbreaks occurred in schools,involving 10 primary schools(66.67％)and 5 middle schools(33.33％).There was no significant difference in attack rate between primary and secondary schools(x2=3.524,P＞0.05).Among the cases,189 were male and 183 were female,with no significant difference in attack rate between males and females(x2=0.102,P＞0.05).The virus strains appeared alternately,including 8 cases(53.33％)of type A(H3N2),3 cases(20.00％)of type A and B mixed,1 case(6.67％)of type B(Victoria),1 case(6.67％)of type B(Yamagata),1 case(6.67％)of type B untyped,and 1 case not detected.After analyzing the influencing factors of the epidemic,the more the number of first reported cases,the more the final number of cases(t=8.883,P＜0.05),and the longer the interval time from the first case to the report time,the longer the duration of the outbreak(t=2.745,P＜0.05).Conclusions The influenza outbreaks in Hedong District mainly occurs in winter and spring,gathering places such as primary and secondary schools are places with a high incidence of influenza outbreaks.Therefore,health administrative departments and education departments should strengthen joint prevention and control mechanism to detect and respond to the outbreaks in a timely manner,reducing the duration of outbreaks and limiting the scale of the epidemic.
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