http://www.newsweek.com/pfizer-covid-booster-shots-cdc-approved-when-where-get-fda-coronavirus-vaccine-1632317

The CDC has endorsed Pfizer COVID booster shots for certain U.S. adults after an advisory committee recommended an extra jab to help at-risk people increase their level of protection.

The health agency said that, according to its updated guidance, people should get a Pfizer-BioNTech COVID vaccine shot at least six months after their initial doses, even if they aren't immunocompromised, if: They are 65 or older or in long-term care settings; or they are aged between 50 and 64 and have underlying medical conditions.