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myocarditis after mRNA vaccination

Myocarditis as a rare but real complication following mRNA COVID-19 vaccination, particularly in adolescent and young adult males.

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Jan 18, 2026

How does the risk of myocarditis after an mRNA booster vary by age, sex, and dosing interval?

Myocarditis after mRNA COVID-19 vaccination is a rare event that clusters in younger males and is largest after the second dose of the primary series, while the excess risk after booster doses is gene...

Jan 6, 2026

What are common short-term side effects after mRNA COVID-19 vaccines and their usual duration?

Common short-term reactions after mRNA COVID-19 vaccines are predictable, usually mild-to-moderate and self-limited — injection‑site pain, fatigue, headache, muscle aches, chills and transient fever a...