Epidemiological characteristics of influenza in Zhanjiang City,Guangdong Province,2017-2022
Objective To perform nucleic acid tests on influenza-like illness(ILI)cases in Zhanjiang City,Guangdong Province during 2017-2022,to analyze the epidemiological characteristics of influenza,and to provide a basis for further optimizing influenza prevention and control measures.Method The monitoring data from influenza sentinel posts from April 2017 to March 2023 were collected and statistically analyzed.Results A total of 87,946 ILI cases were cumulatively reported in Zhanjiang City during 2017-2022,and the annual ILI％in the 6 monitored years ranged from 1.71％to 3.53％,with an average ILI％of 2.55％.6,518 samples of ILI were collected for influenza virus nucleic acid test,782 of which were positive,with the positive rate of 12.00％.The positive rates for each monitored year were 17.07％,18.75％,17.65％,0.18％,10.12％and 8.70％respectively.The detection rate of influenza A virus H3N2 was the highest(39.6％),followed by influenza B virus Victoria,influenza A virus H1N1 and influenza B virus Yamagata.There were three influenza epidemic peaks in spring,summer and winter.Influenza A virus H1N1 and influenza B virus Yamagata were mainly detected in spring and winter,while influenza A virus H3N2 and influenza B virus Victoria were prevalent in summer.There were statistically significant differences in the positive rates among different age groups,and the positive rate was found to be the highest in the group aged 5-14 years(20.46％),followed by the group aged 15-24 years(19.94％)and the group aged 0-4 years(6.68％).No statistically significant difference was found in the positive rates between males and females(P=0.903).Conclusion Influenza was common in spring,summer and winter in Zhanjiang City during 2017-2022.The high-incidence people were concentrated in the group aged 5-24 years.Therefore,it is essential to strengthen the publicity and education on knowledge about influenza prevention and control and improve the activity of vaccination.
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