Related: Case series: 7 cases of myocarditis following mRNA-based COVID-19 vaccination. AND Case series: clinical and cardiac magnetic resonance imaging findings of 4 cases of myocarditis following mRNA-based COVID-19 vaccination. AND Case series: symptomatic acute myocarditis in 7 adolescents following mRNA COVID-19 vaccination. AND CDC says heart inflammation cases were higher than expected in 16- to 24-year-olds after second Covid vaccine shot, but still rare. AND Israel reports link between rare cases of heart inflammation and COVID-19 vaccination in young men. AND CDC is investigating several reports that teenagers and young adults may have developed myocarditis after receiving mRNA vaccines. Most cases were mild, more often in males than females, more often following dose 2 than dose 1, and typically, within 4 days after vaccination.