A large-scale, independent review of real-world safety data confirmed that mRNA COVID-19 vaccines may cause myocarditis in very rare cases. However, the study conducted by the National Academies of Sciences, Engineering, and Medicine found no link between the vaccines and other conditions, including infertility, heart attacks, blood clots, Guillain-Barré syndrome, or Bell’s Palsy.
Messaging may emphasize that the study provides additional evidence of the overall safety of COVID-19 vaccines and the extreme rarity of serious side effects. One of the committee members who conducted the study emphasized that “identifying a harm does not mean that it occurs frequently. Harms associated with vaccines are rare.”
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