Most Viewed Articles from NEJM

After mass vaccination with messenger RNA (mRNA) vaccines against coronavirus disease 2019 (Covid-19), myocarditis in male teenagers emerged as a possible rare side effect, which led to great concern in the public and potentially fostered vaccine

In many countries, the availability of vaccines has marked a turning point in the Covid-19 pandemic. Although the vaccines are imperfect, breakthrough infections in fully vaccinated people remain quite rare, even with recently emerging variants