Myocarditis in children and young adults

".....The roll out of the COVID-19 vaccine to adolescents has begun, following the announcement on 4 August by the Joint Committee on Vaccination and Immunisation (JCVI) that all 16 and 17 year olds should be offered their first dose of the Pfizer-BioNTech vaccine, despite evidence that myocarditis is a real and serious side effect of the vaccine....." 

-  https://www.hartgroup.org/myocarditis-side-effect/