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Vaccine Effectiveness Against Influenza A(H3N2)

The effectiveness of vaccines in preventing influenza A(H3N2) infection and severe disease, including hospitalization, across different age groups and populations.

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Jan 6, 2026

How does vaccine effectiveness measured against hospitalization differ from effectiveness against infection for influenza H3N2?

Vaccine effectiveness (VE) against influenza A(H3N2) typically shows higher protection against severe outcomes like hospitalization than against any infection or mild clinical disease, a pattern obser...