H3N2, a highly contagious subtype of the influenza A virus, is a formidable respiratory pathogen. It spreads rapidly through airborne droplets, meaning a simple cough, sneeze, or conversation in a ...

Prior exposure to one strain of influenza virus may weaken children's ability to mount an effective antibody response against their subsequent exposure to a different flu strain, according to a study ...

Prior exposure to one strain of influenza virus may weaken children's ability to mount an effective antibody response against their subsequent exposure to a different flu strain, according to a study ...

Viral mismatch between circulating strains and vaccine may have weighed down effectiveness ...

Key TakeawaysThis season's flu vaccine didn't work as well as usual, officials sayA new virus strain did not match the shot ...

Flu has overtaken covid in infections and hospitalizations during the winter respiratory virus season, and their virulence is becoming similar.

The World Health Organization (WHO) today announced recommendations for the viral composition of influenza (or "flu") vaccines for the 2026-2027 northern hemisphere influenza season. The announcement ...

As the U.S. flu season winds down, health officials say the flu vaccine didn’t work very well, with one of its worst ...

More than 100 children have died so far this season ...

Interim influenza vaccine effectiveness for the 2025 to 2026 season appears to be lower than in recent influenza seasons, but still provides protection for children and adolescents and for adults, ...

WASHINGTON, DC-The United States has recorded at least 18 million influenza illnesses, 230,000 hospitalizations and 9,300 deaths so far during the current flu season, according to the latest estimates ...