H3N2 influenza explained: Causes, symptoms, risks, and why this flu strain hits harder
H3N2 is a subtype of influenza A virus and powers many seasonal flu epidemics, infecting 10-20% of people worldwide each year. According to CDC surveillance, it made its first jump to humans in 1968 through antigenic shift with avian strains. It now causes up to 50% of flu hospitalizations in severe seasons, striking hardest at…
