Analysis of pathogenic surveillance results of influenza-like illness in Wuwei City,Gansu Province in 2012-2021
Objective To analyze the results of etiology surveillance of influenza-like illness(ILI)in Wuwei City,Gansu Province during 2012-2021,so as to provide scientific evidence for influenza prevention and control in Wuwei.Method Oropharyngeal swabs specimens from ILI patients visiting Wuwei People's Hospital in the period from 2012 to 2021 were tested for influenza virus and its subtypes using fluorescence quantitative polymerase chain reaction.Results A total of 6 715 swabs were tested,of which 15.23％(1 023/6 715)were positive for influenza viruses.Influenza A virus(Flu A)and influenza B virus(Flu B)accounted for 57.58％(589/1 023)and 41.64％(426/1 023)of the positive cases.Among the Flu A viruses,226 were identified as A(H1N1)pdm2009,363 were A(H3N2),none was A(H7N9);of the Flu B viruses,290 were identified as Yamagata lineage(BY),136 were Victoria lineage(BV),and 8 were mixture of Flu A and B viruses.The detection rate was the highest in 2012 of all the years in the study period(28.14％),and the lowest in 2021(4.42％).Epidemic peaks occurred in January and December,with detection rates being 31.72％and 27.48％,respectively.There were seasonal peaks in Flu B virus activity from March to June.No influenza virus cases were detected in August and September.The other months showed dominance of Flu A virus.There was no statistically significant difference in the detection rate of influenza between men and women(x2=0.059,P＞0.05).The highest detection rate was observed in the age group of 5-＜15 years old(19.89％),and the lowest in the age group of 25-＜60 years(8.89％).Conclusions There are influenza-positive cases among ILI patients every year in Wuwei City,with the lowest detection rate in 2021.A(H3N2)and A(H1N1)pdm2009 are the main subtypes of Flu A virus.As for Flu B virus,BY was predominant in 2012-2018,while BV dominated in 2019-2021,and epidemic peaks occurred every year.Children and teenagers(5-＜15 years old)are susceptible to influenza virus infection in Wuwei City.
NETL
NSTL
万方数据
