booster shots, stating the administration can offer a third dose to Americans and still donate vaccine supplies abroad.

Last week, the Food and Drug Administration (FDA) and Centers for Disease Control and Prevention (CDC) authorized a booster dose of the Pfizer vaccine for older Americans and those considered at high risk for complications from the virus.

"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," Surgeon General Dr.

The CDC recommends people ages 65 and older, as well as residents in long-term care facilities, should receive a booster shot six months after completing their primary Pfizer series.

Americans between the ages of 50 and 64 with underlying medical conditions should also get a booster, the agency said.

For those ages 18 to 48, the CDC said they may receive a third shot if they have underlying conditions and based on their individual benefits and risks.