Figure 1. Kaplan–Meier Estimates of Myocarditis at 42 Days.

Shown is the cumulative incidence of myocarditis during a 42-day period after the receipt of the first dose of the BNT162b2 messenger RNA coronavirus disease 2019 (Covid-19) vaccine. A diagnosis of myocarditis was made in 54 patients in an overall population of 2,558,421 vaccinated persons enrolled in the largest health care organization in Israel. The vertical line at 21 days shows the median day of administration of the second vaccine dose. The shaded area shows the 95% confidence interval.