The two federal entities said the US is "fortunate to have highly effective vaccines that are widely available for those 12 and up" and "Americans who have been fully vaccinated do not need a booster shot at this time."However that could still change since the "FDA, CDC and NIH are engaged in a science-based, rigorous process to consider whether or when a booster might be necessary." If it is, then "we are prepared for booster doses if and when the science demonstrates that they are needed."