Epidemiological Characteristics of Influenza-like Illness Outbreaks in Yunnan Province from 2017 to 2023

Yaoyao CHEN; Xingchen WEI; Xiaoyu HAN; Lifen ZHANG

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Yaoyao CHEN, Xingchen WEI, Xiaoyu HAN, Lifen ZHANG. Epidemiological Characteristics of Influenza-like Illness Outbreaks in Yunnan Province from 2017 to 2023[J]. Journal of Kunming Medical University.

Citation:

Yaoyao CHEN, Xingchen WEI, Xiaoyu HAN, Lifen ZHANG. Epidemiological Characteristics of Influenza-like Illness Outbreaks in Yunnan Province from 2017 to 2023[J]. Journal of Kunming Medical University.

Yaoyao CHEN, Xingchen WEI, Xiaoyu HAN, Lifen ZHANG. Epidemiological Characteristics of Influenza-like Illness Outbreaks in Yunnan Province from 2017 to 2023[J]. Journal of Kunming Medical University.

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Epidemiological Characteristics of Influenza-like Illness Outbreaks in Yunnan Province from 2017 to 2023

1.
Institute for Acute Communicable Disease Prevention and Control，Center for Disease Control and Prevention of Yunnan Province，Kunming Yunnan 650022
2.
School of Basic Medical Sciences，Qujing College of Medicine & Health Sciences，Qujing Yunnan 655100，China

Received Date: 2024-12-20
Available Online: 2025-08-12

Abstract

Abstract

Objective To analyze the epidemiological characteristics of influenza-like illness outbreaks in Yunnan Province from 2017 to 2023, and to provide the evidence for the prevention and control of influenza in Yunnan Province. Methods The data of influenza-like illness outbreaks and outbreak specimens were collected in Yunnan Province from 2017 to 2023. Descriptive epidemiological methods were used to describe and analyze the epidemic time, population, region and pathogen distribution. Results A total of 340 influenza-like illness outbreaks were reported in Yunnan Province from 2017 to 2023, with 12586 reported cases and a cumulative incidence of 2.34%. The outbreaks were mainly concentrated in November to January and March of the following year, with a high incidence in winter and spring. Schools were the most important place of outbreak, with primary and secondary school students being the main affected group. The cumulative number of reported cases in Dali Prefecture, Dehong Prefecture, Yuxi City and Kunming City ranked among the top in the province, accounting for 79.71% of the total number of outbreaks in the province. The pathogen types alternated and were mainly prevalent in H1N1 （119 cases）, H3N2 （81 cases）, and Victoria （83 cases）. Conclusion The outbreak of influenza-like illness in Yunnan Province shows the obvious seasonality, and primary and secondary schools are the main outbreak sites. The outbreak surveillance in schools should be strengthened continuously to control the occurrence and development of the epidemic.
- Influenza-like illness,
- Outbreak of epidemic,
- Epidemiological characteristics

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References(20)

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