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Side effects that have been reported during post‑authorization use of the Moderna COVID‑19 Vaccine include:

Severe allergic reactions

Myocarditis (inflammation of the heart muscle)

Pericarditis (inflammation of the lining outside the heart)

Fainting

These may not be all the possible side effects of the Moderna COVID‑19 Vaccine. Serious and unexpected side effects may occur. The Moderna COVID‑19 Vaccine is still being studied in clinical trials .

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