AdvertisementJohnson & Johnson Vaccine Is 66% Effective In Preventing Moderate To Severe COVID-1903:47Download AudioResumeJanuary 29, 2021Scott HensleyfacebookEmailPharmacy technician Sara Berech prepared a dose of the Johnson & Johnson COVID-19 vaccine in December for a clinical trial that includes Rocky Mountain Regional VA Medical Center in Aurora, Colo. (Getty Images)