News FDA panel supports Moderna COVID-19 booster shots for older Americans and other adults at higher risk of infection October 14, 2021 Karen Weintraub and Elizabeth Weise, USA TODAY Comments Off on FDA panel supports Moderna COVID-19 booster shots for older Americans and other adults at higher risk of infection The Moderna COVID-19 booster shot will be a half-dose of the vaccine already given. Data showed it was safe and as effective at the lower dose.