Rare Or Common Events? COVID Vaccine Trials In Children Boost Safety Databases, Triggering Fears Of Heart Events

US FDA seems to want Moderna and Pfizer to study their mRNA vaccines in 3,000 people ages five to 11, suggesting the rate of myocarditis in younger children may be higher than in older teens. Such a finding, and even the hunt for it, could push back any COVID-19 vaccine authorization for this population.