evidence: Several studies have reported associations between coronavirus (COVID-19) vaccination and risk of cardiac diseases, especially in young people; we assessed the impact of COVID-19 vaccination and positive SARS-CoV-2 tests on the risk of cardiac and all-cause mortality in young people (aged 12 to 29 years) in England using a self-controlled case series design. [...] Statistician's comment "Today’s analysis looks at the risk of death after COVID-19 vaccination in young people. Existing studies show that COVID-19 vaccination is linked to an increased risk of cardiac diseases. [...] "Whilst vaccination carries some risks, these need to be assessed in light of its benefits. Our analysis shows that the risk of death is greatly increased following a positive test for COVID-19 even in young people and many studies show that vaccines are highly effective at preventing hospitalisation or death following COVID-19 infection.