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Flu Vaccination Linked to Lower Heart, Stroke Risk After Infection

A Danish registry study suggests prior influenza vaccination is associated with lower short-term cardiovascular risk following breakthrough infection.

  • By

  • Kerri Miller

  • April 7, 2026

  • 3 min

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  • 1

    Prior influenza vaccination reduced the excess risk of acute myocardial infarction and stroke by about half after breakthrough influenza.

  • 2

    The study involved 1,221 patients aged 40 and older, focusing on hospital admissions for cardiovascular events within a year of influenza infection.

  • 3

    The highest cardiovascular risk occurred within the first 3 days post-influenza infection, with a significant decline by days 15 to 28.

  • 4

    Vaccinated patients exhibited lower cardiovascular risks through day 7, although differences were not statistically significant for individual outcomes.

  • 5

    The study's design controlled for time-invariant factors, but limitations included potential underestimation of risk and residual confounding.

Original Source(s)

Flu Vaccination Linked to Lower Heart, Stroke Risk After Infection

  • by Kerri Miller

  • April 7, 2026

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