Results 21 to 30 of about 8,158 (163)

Retracted article: Moderate protection from vaccination against influenza A(H3N2) subclade K in Beijing, China, September to December 2025

Eurosurveillance
[This article was retracted on 19 February 2026.] During the early 2025/26 influenza season, influenza A(H3N2) subclade K rapidly predominated in Beijing, China.
Peng Yang
doaj   +3 more sources

Influenza vaccine effectiveness from nine studies during drifted A(H3N2) subclade K predominance, Europe, September 2025 to January 2026 [PDF]

Eurosurveillance
The European 2025/26 influenza season is dominated by the influenza A(H3N2) virus, with most sequenced viruses belonging to subclade K, genetically drifted from the vaccine virus, raising concerns around vaccine effectiveness (VE).
the European IVE group
doaj   +5 more sources

Cross-sectional study on protective antibodies against influenza A virus subtypes and cross-protection against influenza A(H3N2) subclade K, Portugal, August 2025 [PDF]

Eurosurveillance
The 2025/26 season was marked by co-circulation of influenza A subtypes, with the first detection of A(H3N2) subclade K in September 2025. In August 2025 in Portugal, 14.8% (95% CI: 12.2–17.8) of 886 persons tested had cross-protective antibodies against
Ana Paula Rodrigues
doaj   +4 more sources

Influenza A(H3N2) subclade K (J.2.4.1) viruses associated with a surge at a university health clinic, Arizona, the United States, November to early December 2025 [PDF]

Eurosurveillance
Genomic surveillance during an influenza surge between November and early December 2025 at a university health clinic in the United States identified A(H3N2) subclade K (J.2.4.1) viruses with shared haemagglutinin amino acid substitutions in antigenic ...
Vel Murugan
doaj   +5 more sources

Emergence of influenza A(H3N2) subclade K in northeast Ohio in autumn 2025 [PDF]

Journal of Clinical Microbiology
Xuan Xu, William Hull, David Plunkett, Zheng Jin Tu, Ted M. Ross, Daniel D. Rhoads, Hannah Wang   +6 more
doaj   +4 more sources

Influenza A(H3N2) subclade K (J.2.4.1): epidemiology in Asia, clinical context, and the “superflu” framing [PDF]

New Microbes and New Infections
Timotius Ivan Hariyanto
doaj   +4 more sources

Converging influenza threats: Seasonal A(H3N2) (including subclade K) dynamics and the persistent pandemic risk of A(H5N1)

Travel Medicine and Infectious Disease
J David Acosta-España
exaly   +5 more sources

Retraction note: Moderate protection from vaccination against influenza A(H3N2) subclade K in Beijing, China, September to December 2025 (Euro Surveill. 2026;31(2))

Eurosurveillance
Eurosurveillance editorial team
doaj   +4 more sources

Reduced T cell epitope cross-conservation and immunogenic potential is associated with emergence of a dominant influenza subclade K in 2025

Human Vaccines & Immunotherapeutics
Subclade K is a newly emergent influenza A/H3N2 strain that became the dominant strain circulating globally; more than 90% of influenza A virus (IAV) cases in 2025–26 were subclade K.
Andres H. Gutierrez, Jacob Tivin, Ben Gabriel, Anne S. De Groot   +3 more
doaj   +2 more sources

Northern Hemisphere 2025/26 influenza vaccine effectiveness during months with influenza A(H3N2) subclade K predominance— Suzhou, Eastern China

International Journal of Infectious Diseases
During this 2025/26 Northern Hemisphere influenza season, the predominant influenza A(H3N2) subclade K virus has binding site mutations and postvaccine sera reduced inhibition, raising concerns about antigenic differences with available vaccines.
Pengwei Cui, Suizan Zhou, Anna N. Chard, Junrong Wang, Kathrine R. Tan, Ying Song, Yuanyuan Pang, Yuanyuan Zhang, Huiyan Yu, Zefeng Dong, Zhiyuan Zhu, Yayun Tan, Haibing Yang, Haitao Wang, Xiaokun Yang, Zhibin Peng, Kathryn E. Lafond, Eduardo Azziz-Baumgartner, Liling Chen   +18 more
doaj   +3 more sources