mRNA COVID vaccine study from Vaccine Safety Datalink shows risk of myocarditis/pericarditis 0-7d post Vax (ages 5-39) is ~1/200K doses (1st dose), 1/ 30K(2nd dose), 1/50K (1st booster); w/ higher risk in adolescent males https://t.co/J1u038qxB7 https://t.co/vEUNbOvEQf