So far, more than 161 million people across the country have been vaccinated with around 4.5 million of them between the ages of 12 and 18. while the Food and Drug Administration has since allowed children between the ages of 12 and 15 to receive the jab. The Pfizer-BioNTech vaccine has been administered to those 16 and above since December. The agency's vaccine safety group decided to communicate the information to vaccine providers out of an abundance of caution. The CDC say that so far, the numbers of those reporting myocarditis is no greater than would normally be seen in young people. The symptoms include fatigue and chest pain alongside arrhythmias (a problem with the rate or rhythm of the heartbeat) and cardiac arrest.