Three-quarters of eligible Americans have received at least one dose of a Covid-19 vaccine and some are now able to receive an additional booster shot. But the virus still poses a great threat to more than 70 million eligible people who remain unvaccinated.
"The most vulnerable are those unvaccinated," Dr. Rochelle Walensky, the director of the US Centers for Disease Control and Prevention, said Friday.
"Starting today, if you are six months out from your last dose of the Pfizer vaccine, you are eligible for a booster if you fall into one of three high-risk groups," US Surgeon General Dr. Vivek Murthy said during a briefing.
"Number one: You are 65 or older. Number two: You have a medical condition that puts you at high risk of severe illness with Covid and these conditions include obesity, diabetes, high blood pressure, chronic kidney disease and others. And Number three: You work or live in a setting where you are at high risk of exposure to Covid. This includes health care workers, teachers, those living in shelters or prisons and grocery store workers," Murthy said.
Boosters have not yet been endorsed for the two other vaccines offered in the US -- those from Moderna and Johnson & Johnson. Health officials are working to determine next steps for recipients of those vaccines.