CDC recommends that certain populations receive a booster shot of Pfizer-BioNTech’s COVID-19 Vaccine at least 6 months after completion of their 2-dose Pfizer vaccine series. People who should receive a Pfizer-BioNTech COVID-19 Vaccine booster include: - People ages 65 and older - People 18 living in long-term care settings - People ages 50–64 with an underlying medical condition People who may receive a Pfizer-BioNTech COVID-19 Vaccine booster include: - People ages 18–49 with an underlying med