On Sept. 22, the Food & Drug Administration authorized booster shots of the Pfizer COVID vaccine for certain groups of people. You may be wondering: Who should get it, and when? And why? Here's everything you need to know about the Pfizer booster shots. Read on to find out more—and to ensure your health and the health of others, don't miss these Sure Signs You May Have Already Had COVID . 1 Who Should Get the Pfizer Booster As of Oct. 8, the FDA has authorized a single booster shot of the Pfizer COVID vaccine for the following groups: People 65 years and older People 18 or older who live in long-term care settings People 18 or older who have underlying medical conditions People 18 or older who work or live in high-risk settings These recommendations are subject to change; the FDA may authorize booster shots for additional groups of people at a later date. Pfizer is the only vaccine that has been authorized for booster shots at this point. Both Moderna a