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Early vaccine effectiveness estimates against medically attended laboratory-confirmed influenza based on influenza surveillance, Beijing, China, 2024/25 season
- Ying Sun1,2,3 , Weixian Shi1,2 , Daitao Zhang1,2,3 , Chunna Ma1,2 , Zhaomin Feng1,2,3 , Jiaojiao Zhang1,2 , Dan Wu1,2 , Li Zhang1,2 , Jia Li1,2 , Wei Duan1,2 , Yingying Wang1,2 , Jiaxin Ma1,2 , Lu Zhang1,2 , Xiaodi Hu1,2 , Peng Yang1,2,3 , Quanyi Wang1,2,3
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View Affiliations Hide AffiliationsAffiliations: 1 Beijing Key Laboratory of Surveillance, Early Warning and Pathogen Research on Emerging Infectious Diseases, Beijing Center for Disease Prevention and Control, Beijing, China 2 Beijing Research Center for Respiratory Infectious Diseases, Beijing, China 3 School of Public Health, Capital Medical University, Beijing, ChinaPeng Yangyangpengcdc 163.com
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Citation style for this article: Sun Ying, Shi Weixian, Zhang Daitao, Ma Chunna, Feng Zhaomin, Zhang Jiaojiao, Wu Dan, Zhang Li, Li Jia, Duan Wei, Wang Yingying, Ma Jiaxin, Zhang Lu, Hu Xiaodi, Yang Peng, Wang Quanyi. Early vaccine effectiveness estimates against medically attended laboratory-confirmed influenza based on influenza surveillance, Beijing, China, 2024/25 season. Euro Surveill. 2025;30(7):pii=2500084. https://doi.org/10.2807/1560-7917.ES.2025.30.7.2500084 Received: 30 Jan 2025; Accepted: 20 Feb 2025
Abstract
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.
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