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Covid infection did not increase incidence of post-covid myocarditis or pericarditis. The Incidence of Myocarditis and Pericarditis in Post COVID-19 Unvaccinated Patients-A Large Population-Based Study Myocarditis and pericarditis, post-acute cardiac sequelae of COVID-19 infection, arising from adaptive immune responses. ? incidence Retrospective cohort study Study group, had infection N = 196,992 adults after COVID-19 infection (Clalit Health Services) March 2020 to January 2021 Inpatient myocarditis and pericarditis diagnoses, from day 10 after positive PCR Israeli vaccination program initiated on 20 December 2020 Follow-up was censored on 28 February 2021 Control cohort, never infected N = 590,976 adults, with at least one negative PCR and no positive PCR (age- and sex-matched) Calculated back
