Early vaccine effectiveness estimates against medically attended laboratory-confirmed influenza based on influenza surveillance, Beijing, China, 2024/25 season
We estimated early influenza vaccine effectiveness (VE) for the 2024/25 season in outpatients, in Beijing using a test-negative design. A(H1N1)pdm09 dominated (99.3%), all sequenced strains (n = 38) clustered in clade 6B.1A.5a.2a, and 37 of 38 antigenically similar to the vaccine strain. VE against any influenza virus infection was 48.5% (95% CI: 34.8-59.5) and 48.7% (95% CI: 35.1-59.7) against A(H1N1)pdm09. Vaccination in the current or previous season against any influenza showed a VE of 52.5% to 54.9%, compared to no vaccination in both seasons.
Authors
- Daitao Zhang
- Jiaxin Ma (ORCID: https://orcid.org/0000-0003-0730-8502)
- Peng Yang (ORCID: https://orcid.org/0000-0002-2613-941X)
- Wei Duan (ORCID: https://orcid.org/0000-0002-9306-7161)
- Dan Wu (ORCID: https://orcid.org/0000-0003-0415-5467)
- Zhaomin Feng (ORCID: https://orcid.org/0000-0002-2559-7662)
- Yingying Wang (ORCID: https://orcid.org/0000-0003-3913-077X)
- Lu Zhang (ORCID: https://orcid.org/0000-0002-2794-7371)
- Jia Li (ORCID: https://orcid.org/0000-0002-3108-8645)
- Jiaojiao Zhang (ORCID: https://orcid.org/0000-0002-2699-6729)
- Quanyi Wang (ORCID: https://orcid.org/0000-0001-6773-0057)
- Chunna Ma (ORCID: https://orcid.org/0000-0002-5997-0912)
- Xiaodi Hu (ORCID: https://orcid.org/0000-0002-0591-2581)
- Ying Sun
- Weixian Shi
- Li Zhang (ORCID: https://orcid.org/0000-0002-5806-6403)
Institutions
- Capital Medical University (CN)
- Beijing Center for Disease Prevention and Control (CN)
Publication Details
- Journal
- Eurosurveillance
- Published
- 2025-02-20
- DOI
- https://doi.org/10.2807/1560-7917.es.2025.30.7.2500084
- Citations
- 8
- Primary Topic
- Influenza Virus Research Studies
- Type
- article
- Field-Weighted Citation Impact
- 10.83