Most people eligible for the booster shots, estimated at more than 86 million people, have not gotten them, according to the CDC. The Biden administration continues to view vaccination uptake as critical to preventing severe disease and death in the wave of coronavirus infections driven by omicron. “The good news is that for people who received a third booster dose, the effectiveness of three doses is very high and protects against moderately severe and severe disease. Health experts on Friday welcomed the new CDC data, saying they hoped it would encourage millions of vaccinated Americans to get booster shots. For vaccinated people older than 65, the age group most vulnerable to severe disease, more than one-third have not received a booster.
