In a case series published online June 7 in Pediatrics, the authors present seven cases of acute myocarditis or myopericarditis in healthy male adolescents within four days of receiving the second dose of the Pfizer-BioNTech COVID-19 vaccination.

In a case series published online June 7 in Pediatrics, the authors present seven cases of acute myocarditis or myopericarditis in healthy male adolescents within four days of receiving the second dose of the Pfizer-BioNTech COVID-19 vaccination.