The influenza virus that caused the 1968 pandemic, in contrast, had a different HA subtype, H3, and a different NA subtype as well, N2. As a result, it is classified as influenza A (H3N2).

When comparing the H1N1 and H3N2 influenza A viruses, particular challenges exist in H3N2 subtypes because of stalk mutations in circulating strains and the unstable structure of stalk proteins ...

In lab tests, the antibodies inhibited propagation of viruses from subtype H2N2, the subtype that caused pandemic influenza in 1957-58, and H3N2 viruses from humans, swine, and birds.

These immune responses conferred broad protection against various influenza A virus subtypes, including human H1N1 and H3N2, and avian H5N1 strains.

We've all heard of "the flu" but when it comes to types, subtypes and variants, influenza can get a bit complicated. According to the U.S. Centers for Disease Control and Prevention (CDC), nearly ...

Abstract Although predicting which influenza virus subtype will cause the next pandemic is not yet possible, public health authorities must continually assess the pandemic risk associated with ...

Determining the structure of a protein called hemagglutinin on the surface of influenza B is giving researchers at Baylor College of Medicine and Rice University in ...

The 2022 influenza vaccine is quadrivalent (targets four distinct viruses): two influenza A viruses (subtypes H3N2 and H1N1) and two influenza B viruses from distinct lineages. Within each flu A ...

The symptoms of influenza A vary from person to person and depend on subtype, but generally consist of coughing, runny or stuffy nose, sneezing, sore throat, fever, headache, fatigue and body aches.