08/29/2026
How Effective Are Flu Shots at Preventing Influenza?
Flu shots are effective at reducing the risk of influenza, though effectiveness can vary from season to season. Effectiveness depends on factors such as how well the vaccine matches circulating flu strains and individual immune response. Even in years with a moderate match, flu shots significantly lower the likelihood of severe illness, hospitalization, and flu-related complications.
Vaccinated individuals who do get the flu often experience milder symptoms and recover more quickly. Flu shots also reduce the burden on healthcare systems during peak flu season. While not a guarantee, vaccination remains the most effective tool available for reducing influenza-related illness and complications.
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