The number of influenza cases is surging across the United States, putting significant strain on many hospitals. We asked the ...

Recommendations on the strain composition of influenza virus vaccines for the 2025-2026 US season have been issued by FDA.

Recent viral mutations have shown avian influenza’s adaptability to mammalian hosts, prompting infectious disease, animal ...

There are 16 different hemagglutinins and nine different neuraminidases, and reassortment of these two antigens determines the influenza A virus subtype (e.g., H1N1 or H3N2). Embedded within the ...

Despite variations by age group and influenza virus type, the 2023-2024 influenza vaccine was protective against outpatient illness in pediatric and adult patients.

Influenza A is divided into subtypes based on two proteins on the virus's surface: hemagglutinin and neuraminidase. These lead to different combinations—with H1N1 and H3N2 presently the most ...

Due to low circulation of influenza A(H3N2) in Europe to date ... Given the lower vaccine effectiveness for specific virus subtypes and among older adults in certain studies, other prevention ...

Dr. Gary Green, an infectious disease expert with Sutter Health, said the earlier peak in flu cases, about a month ago, was caused by the spread of a mix of Influenza A subtypes H1N1 and H3N2.