Epidemiological characteristics of influenza in Beijing， 2023‒2024
10.19428/j.cnki.sjpm.2025.250095
- VernacularTitle:2023—2024年北京市流感流行特征
- Author:
Lu ZHANG
1
;
Ying SUN
1
;
Li ZHANG
1
;
Chunna MA
1
;
Jiaojiao ZHANG
1
;
Jia LI
1
;
Jiaxin MA
1
;
Yingying WANG
1
;
Xiaodi HU
1
;
Daitao ZHANG
1
;
Wei DUAN
1
Author Information
1. Institute for Infectious Disease and Endemic Disease Control, Beijing Center for Disease Prevention and Control, Beijing Research Center for Respiratory Infectious Diseases, Beijing Key Laboratory of Surveillance, Early Warning and Pathogen Research on Emerging Infectious Diseases, Beijing 100013, China
- Publication Type:Journal Article
- Keywords:
influenza;
surveillance;
influenza-like illness;
influenza comprehensive index;
classification
- From:
Shanghai Journal of Preventive Medicine
2025;37(10):821-825
- CountryChina
- Language:Chinese
-
Abstract:
ObjectiveTo understand the epidemic characteristics of influenza in Beijing from 2023 to 2024, and to provide a scientific basis for the prevention and control of influenza. MethodsData on influenza-like illness (ILI) from secondary level and above hospitals, etiology surveillance data, and influenza clusters outbreaks data from 2023‒2024 were used to analyze the epidemic trend and pathogenic characteristics of influenza. Furthermore, an influenza comprehensive index was used to categorize the epidemic intensity at the severity level. ResultsA total of 2 065 857 ILI cases were reported in 2023‒2024 epidemic season, and the percentage of ILI was 3.67%. The age group of 5‒14 years accounted for the highest proportion of ILI (30.48%). A total of 41 766 throat swabs from ILI were detected, with a positive rate of 17.28%.A (H3N2) (51.86%) and B Victoria (41.93%) were the most prevalent subtypes of influenza virus. Clustered influenza outbreaks occurred mainly in primary schools (57.78%) and middle schools (35.55%), mainly caused by the influenza A (H3N2) subtype (85.93%). According to the influenza comprehensive index (I), the period of influenza activity and above (I>0.5) lasted for a total of 37 weeks, accounting for 71.15% of the entire influenza season. ConclusionCompared with previous years, the epidemic level of influenza in Beijing was increased in 2023‒2024, and the peak time became earlier. The comprehensive index method can objectively evaluate the level of influenza epidemic and provide suggestions for the future prevention and control of influenza in Beijing.
