Analysis of influenza epidemiologic features in Sanya,2018-2023
Objective To investigate the epidemiological characteristics of influenza in Sanya,Hainan Province,China,before and after the implementation of public health control measures for COVID-19,and to provide a basis for the formulation of targeted influenza control measures.Methods The influenza surveillance data in Sanya from January 2018 to April 2023 was collected in the national influenza surveillance system.With the use of SPSS 26.0 software,the positive rate of influenza virus nucleic acid test and other epidemiological indicators were described,compared the percentage of cases of influenza-like illness in total cases(ILI％)and influenza virus nucleic acid positive rate in the same periods of different years.The changes in influenza epidemics before(February 2020 to December 2022),during,and after the implementation of COVID-19 control measures were analyzed.Results From January 2018 to April 2023,a total of 53 173 cases of ILI were reported in Sanya,accounted for 3.2％of the total number of outpatients.Among them,565 cases were positive for nucleic acids of influenza viruses,and the case number of 2020,2021 and 2022 were significantly fewer than those of in 2018 and 2019.From 2018 to 2023,ILI％were 3.77,4.56,2.01,2.64,2.83 and 3.10,respectively,showed a significant difference between them(x2=3,974.646,P＜0.05).The influenza virus nucleic acid positive rates were 7.90％,16.25％,3.29％,9.35％,7.43％and 22.44％,respectively.The positive rate reached peaks in January to March and December in 2018,peaked in March to July and December in 2019,decreased rapidly from 42.35％in January to 0 in February in 2020 and remained at 0 until July in 2021,and rapidly increased to 52.5％and 40.24％in March and April,2023,respectively.Conclusion The implementation of public health control measures during the COVID-19 pandemic substantially reduced the incidence of influenza,which could be used for influenza control in the future.
NETL
NSTL
万方数据
