The vaccine is intended to be an intramuscular injection. The risk of myocarditis is possibly linked to an accidental intravenous injection. With aspiration, th

The vaccine is intended to be an intramuscular injection. The risk of myocarditis is possibly linked to an accidental intravenous injection. With aspiration, the person performing the injection has a chance to detect that they hit a blood vessel instead of the muscle and try again.