Epidemiological characteristics and etiological surveillance of influenza-like cases in sentinel hospitals in Haixi Prefecture from 2017 to 2022
Objective To analyze the epidemiological characteristics and etiological surveillance results of influenza-like illness(ILI)in Haixi Prefecture from 2017 to 2022,and to provide reference for the prevention and control of influenza.Methods ILI and etiological surveillance data of 2 sentinel hospitals and 2 influenza network laboratories in Haixi Prefecture from 2017 to 2022 were collected.Excel 2021 software was used to establish a database.SPSS 22.0 software was used for statistical analysis.Chi-square test was used for comparative analysis of rates,and P＜0.05 was considered statistically significant.Results A total of 22 376 cases of ILI were detected in 2 sentinel hospitals and 2 influenza network laboratories in Haixi Prefecture from 2017 to 2022,with a ILI percentage(ILI％)of 3.45％.ILI％was highest in 2017(5.35％)and lowest in 2020(2.09％).A total of 8059 ILI throat swab samples were collected,and 833 strains of influenza virus were isolated,with a positive rate of 10.34％.Among them,influenza A(H3N2)subtype was the most(286 strains,34.33％),followed by influenza A(H1N1)subtype(283 strains,33.97％)and B Victoria lineage(234 strains,28.09％),and B Yamagata lineage was the least(30 strains,3.60％).The positive rate of influenza virus was 16.67％in winter,11.96％in spring,4.71％in summer and 1.31％in autumn.The positive rates of influenza virus in different seasons were significantly different(x2=328.349,P＜0.001).Conclusions From 2017 to 2022,there was an obvious high incidence of influenza in Haixi Prefecture in winter and spring.The virus types were mainly influenza A H3N2,H1N1 and B Victoria lineage,and the influenza subtypes alternated.Children under 5 years old were the priority groups for prevention and control.
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