A healthcare professional places a band-aid on a patient after administering a dose of the Pfizer-BioNTech Covid-19 vaccine at Boston Medical Center in Boston, Massachusetts, U.S., on Thursday, June 17, 2021.
Still, no vaccine is 100% effective at preventing the disease and there will be "a small percentage of fully vaccinated people who still get sick, are hospitalized, or die from COVID-19," the agency said. .
The one-dose Johnson & Johnson vaccine is about 72% effective against moderate to severe disease, according to U.S
have been fully vaccinated, according to the CDC