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| Epidemiological characteristics of influenza in Huzhou City from 2014 to 2023 |
| HU Xiaoqiang, LIU Yan, ZHOU Sifan, ZHANG Zizhe, WANG Yuda, SHEN Jianyong
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| Huzhou Center for Disease Control and Prevention (Huzhou Institute of Public Health Supervision), Huzhou, Zhejiang 313000, China |
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Abstract Objective To analyze the epidemiological characteristics of influenza in Huzhou City, Zhejiang Province from 2014 to 2023, so as to provide a reference for the improvement of influenza prevention and control measures. Methods The data of influenza cases in Huzhou City from 2014 to 2023 were collected from the China Disease Prevention and Control Information System. Descriptive epidemiological methods were used to analyze the population and regional distribution characteristics of influenza. Annual percent change (APC) and average annual percent change (AAPC) were used to analyze the trend of influenza incidence in Huzhou City from 2014 to 2023. Results A total of 83 277 influenza cases were reported in Huzhou City from 2014 to 2023, with an average annual reported incidence of 268.68/105. From 2014 to 2023, the reported incidence of influenza in Huzhou City showed an upward trend (AAPC=68.748%, P<0.05), with a slow upward trend from 2014 to 2021 (APC=31.055%, P<0.05) and a sharp upward trend from 2021 to 2023 (APC=308.782%, P<0.05). The average annual reported incidence of influenza was 270.72/105 in males and 266.54/105 in females, and the difference was not statistically significant (P>0.05). The average annual reported incidence of influenza in children aged 5-<15 years was 1 502.77/105. The reported incidences of influenza in Deqing county, Changxing county, and Anji county were 551.44/105, 370.47/105, and 175.31/105, respectively. From 2014 to 2023, the trends of reported influenza incidence in males, females, residents aged 5-<15 years, and 15-<25 years were consistent with the whole population. The reported influenza incidence in each district (county) from 2021 to 2023 was consistent with Huzhou City from 2021 to 2023. Conclusions The reported incidence of influenza in Huzhou City showed an overall upward trend from 2014 to 2023, especially from 2021 to 2023. There was no significant gender difference. The majority of the cases were aged 5-<15 years, and the high incidence areas were Deqing County.
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Received: 09 May 2025
Revised: 21 August 2025
Published: 16 September 2025
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