Key result
Second mRNA COVID-19 vaccine dose is linked to myocarditis in three Japanese men.
Reports three cases of myocarditis following the second dose of an mRNA-based COVID-19 vaccine in Japanese men.
Does not alter vaccination recommendations; leaves open causality and incidence of myocarditis after mRNA COVID-19 vaccines.
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Sunaga et al. (2022) studied this question. A second mRNA-based COVID-19 vaccine dose was associated with the development of myocarditis in three Japanese men.
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