Epidemiological and etiological analysis of influenza-like illness in Dongying City,Shandong Province,2013-2023
Objective To analyze the epidemiological and etiological characteristics of influenza-like illness(ILI)in Dongying City,Shandong Province,aiming to provide scientific evidence for influenza prevention and control.Methods Through the China influenza surveillance information system,the data of ILI and pathogen surveillance in Dongying City from April 2013 to March 2023 were collected,and the epidemiological characteristic and pathogen distribution of ILI were analyzed.Results A total of 307 723 ILI cases were reported in Dongying City from April 2013 to March 2023 with an ILI rate of 3.87％.Incidence peaks occurred during the winter-spring seasons,with the ILI rate peaking from the 48th week of each year to the 6th week of the following year(winter).The differences in ILI rates among different monitoring years were statistically significant(x2=9 542.089,P＜0.01).The age distribution of ILI was mainly in the age group of 0-＜5 years old(191 414 cases,62.20％).Out of 7 982 swabs collected from ILI cases,948 influenza virus strains were identified,with a positive rate of 11.88％.The most prevalent subtypes were influenza A(H1N1)virus(328 cases,34.60％).Influenza virus detection rates were highest during the winter-spring seasons,and different influenza seasons showed characteristics of single dominant strains circulating alternately or multiple subtypes co-circulating.Conclusions The epidemic characteristics of influenza in Dongying City were basically consistent with the influenza epidemic characteristics in the north of China.Targeted attention should be given to children and the elderly,along with efforts to promote influenza prevention and control measures to enhance population immunity.
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