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The seasonal flu vaccine protects against the three main influenza strains that scientists predict will most likely be in circulation the following influenza season. |
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The vaccine is updated each year in anticipation of changes in the influenza virus strains that could cause significant disease, despite previous vaccination and/or influenza infection. |
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Vaccination is the principal method for reducing the burden of influenza. |
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When the vaccine and circulating influenza strains are similar, influenza vaccination is 70-90% effective in preventing influenza in adults under 65 years of age. |
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Two seasonal flu vaccine formulations are approved in the US: |
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The flu shot is given with a needle. It is inactivated, which means it contains killed virus and cannot give the flu. It is administered by intra muscular injection |
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The intranasal flu vaccine is made with weakened live attenuated viruses that do not cause the flu. It is sprayed into the nostrils. This vaccine is reserved for healthy people between two and 49 years |
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| What is It | Why Get It | When to Get It | Who Should Get It |
