Today, the National Administration for Disease Control and Prevention published popular science questions and answers on influenza vaccination, providing authoritative interpretations on issues related to the high influenza season, people susceptible to influenza, and influenza vaccination. Currently, seasonal epidemics are mainly caused by H1N1 and H3N2 subtypes of influenza A virus, and the Victoria strain of influenza B virus. The dominant strain is different in different epidemic seasons. Even within the same epidemic season, different types and subtypes of influenza virus may alternately become dominant strains. Since the influenza virus mutates frequently, and the level of protective antibodies produced after vaccination gradually declines over time, the protective effect after vaccination can generally last 6 to 8 months, so the influenza vaccine needs to be vaccinated every year.

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