Time for vaccine booster plan 'is now' -U.S. Surgeon General

"If you are fully vaccinated, you still have a high degree of protection from the worst outcomes of COVID-19, severe disease, hospitalization, and death, so we are not recommending that you go out and get a booster today," U.S. Surgeon General Dr. Vivek H. Murthy said.

U.S. officials are prepared to offer a third shot to Americans who completed their initial inoculation in two-dose COVID-19 vaccines made by Moderna Inc and by Pfizer Inc and BioNTech AG at least eight months ago, the Department of Health and Human Services said in a statement.