CDC – Seasonal Influenza (Flu) – Selecting the Viruses in the …

February 22, 2008 — Jesse

Each year, the seasonal influenza vaccine contains three influenza viruses – one influenza A ( H3N2 ) virus, one regular seasonal influenza A (H1N1) virus (not the 2009 H1N1 virus), and one influenza B virus. The influenza viruses in the …

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CDC – Seasonal Influenza (Flu) – Selecting the Viruses in the …

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