OCCUPATION AND HEALTH ›› 2026, Vol. 42 ›› Issue (14): 1964-1968.

• Treatise—Epidemiology and Preventive Health Care • Previous Articles     Next Articles

Analysis of epidemic characteristics of influenza in Tongren City from 2013 to 2023

YANG Xiaoting, LI Jianhua(), ZHANG Junli, YAN Xiaoxu, LUO Jin   

  1. Tongren Center for Disease Control and PreventionTongrenGuizhou 554300, China
  • Received:2025-09-09 Revised:2025-11-03 Online:2026-07-15 Published:2026-07-16
  • Contact: LI Jianhua,E-mail:2607217749@qq.com

Abstract:

Objective To analyze the epidemiological and etiological characteristics of influenza in Tongren City based on the surveillance data and information of influenza in Tongren from 2013 to 2023,summarize the epidemic regular of influenza in Tongren,and provide scientific basis for the prevention and control of influenza. Methods Descriptive epidemiological methods were used to analyze the epidemic characteristics of influenza in Tongren from 2013 to 2023. Results A total of 69 878 influenza like illness(ILI) were reported in Tongren from 2013 to 2023,the ILI% was 4.78%.The epidemic trend was general prevalence throughout the year,with no obvious seasonality,and occasional peak in summer,and the overall pattern fluctuated in waves.There was a statistically significant difference in ILI% in different years(χ2=37 255.922,P<0.01),and there was a statistically significant difference in ILI composition among different age groups(χ2=15 258.087,P<0.01). From 2013 to 2023,a total of 13 420 samples were tested for nucleic acid,of which 1 918 were positive,with a positive detection rate of 14.29%,and there were statistically significant differences in the positive rate of influenza virus among different years,age groups,and months(χ2=333.566,737.266, 647.154,all P<0.01). Influenza A and B viruses were mainly co-epidemic,seasonal influenza H3 subtype and new H1N1 were prevalent in influenza A,and Victoria was the main type of influenza B. The number of positive influenza nucleic acid in 5-<15 years old group was the highest(35.92%),followed by 15-<25 years old group(24.45%). According to the monthly distribution of influenza cases,the epidemic level was higher from November to July of the following year,and the peak was concentrated from December to April of the following year. There was no statistically significant difference in the positive rate of influenza virus nucleic acid testing between males and females(P>0.05). Conclusion In view of the epidemic situation of influenza in Tongren City,the prevention and control measures such as influenza early warning and prediction should be taken before the influenza epidemic,encouraging people to take 4-valent influenza vaccine,and positive non-drug intervention measures can also be taken to reduce the level of influenza activity.

Key words: Influenza, Epidemic characteristics, Surveillance, Seasonality, Nucleic acid detection, Prevention and control measures

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