Early vaccine effectiveness estimates against medically attended laboratory-confirmed influenza based on influenza surveillance, Beijing, China, 2024/25 season.

• Tác giả: Wei Duan, Zhaomin Feng, Xiaodi Hu, Jia Li, Chunna Ma, Jiaxin Ma, Weixian Shi, Ying Sun, Quanyi Wang, Yingying Wang, Dan Wu, Peng Yang, Daitao Zhang, Jiaojiao Zhang, Li Zhang, Lu Zhang
• Ngôn ngữ: eng
• Thông tin xuất bản: Sweden : Euro surveillance : bulletin Europeen sur les maladies transmissibles = European communicable disease bulletin , 2025
• Bộ sưu tập: NCBI
• ID: 238518

Tóm tắt

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.