Table 1.

Estimated incidences of myocarditis and pericarditis after COVID-19 vaccination in existing cohort studies.

OUTCOME	ESTIMATED INCIDENCE	POPULATION	SOURCE
Vaccine: BNT162b2
Myocarditis and pericarditis	1.71 per 100,000 person-days1	Males aged 18–25	Wong et al. [21]
Myocarditis and pericarditis	0.52 per 100,000 person-days1	Females aged 18–25	Wong et al. [21]
Myocarditis and myopericarditis	1.5 per 100,000 individuals2	Males (all ages)	Husby et al. [24]
Myocarditis and myopericarditis	1.3 per 100,000 individuals2	Females (all ages)	Husby et al. [24]
Myocarditis and myopericarditis	1.6 per 100,000 individuals2	Individuals aged 12–39	Husby et al. [24]
Myocarditis and myopericarditis	1.0 per 100,000 individuals2	Individuals aged 12–17	Husby et al. [24]
Myocarditis	IRR after first dose: 1.313	All individuals	Patone et al. [5]
	IRR after second dose: 1.303
Vaccine: mRNA-1273
Myocarditis and pericarditis	2.17 per 100,000 person-days1	Males aged 18–25	Wong et al. [21]
Myocarditis and pericarditis	0.45 per 100,000 person-days1	Females aged 18–25	Wong et al. [21]
Myocarditis and myopericarditis	6.3 per 100,000 individuals2	Males (all ages)	Husby et al. [24]
Myocarditis and myopericarditis	2.0 per 100,000 individuals2	Females (all ages)	Husby et al. [24]
Myocarditis and myopericarditis	5.7 per 100,000 individuals2	Individuals aged 12–39	Husby et al. [24]
Myocarditis	IRR after first dose: 2.973	All individuals	Patone et al. [5]
	IRR after second dose: 9.843
Vaccine: ChAdOx1
Myocarditis and pericarditis	0.18 per 100,000 individuals4	All individuals	Rahman et al. [25]
Myocarditis	IRR after first dose: 1.293	All individuals	Patone et al. [5]
	IRR after second dose: 1.003

¹ Estimate only for incidence after second dose of the vaccine; ² Incidence per 100,000 vaccinated individuals within 28 days of vaccination; ³ Incidence Rate Ratios (IRRs) for 1–28 days following vaccination, included here as incidence estimates were not available; ⁴ Incidence per 100,000 vaccinated individuals within 21 days of vaccination.