Type A H3N2 influenza accounts for 95% of cases and is the absolute main force this winter.

According to data from the national influenza monitoring network, the main circulating influenza strain in China is type A H3N2 subtype, accounting for around 95% of influenza viruses. Experts say that the alternating of influenza virus types and subtypes is common in different or even the same influenza season, and H3N2 is not a new subtype. Influenza vaccines are multi-valent vaccines that can cover various circulating types and subtypes.