The CDC expanded eligibility for an additional booster dose for certain individuals who may be at higher risk of severe outcomes from COVID-19. Boosters are safe and provide substantial benefit. CDC continues to recommend that all eligible adults, adolescents, and children 5 and older be up to date on their COVID-19 vaccines, which includes getting boosters when eligible.

Second booster shots using an mRNA vaccine are recommended for those who are:

• Age 12 and older with weakened immune systems and received their initial booster at least 4 months ago
• Age 18 and older and received the Johnson & Johnson vaccine for their primary series and received a Johnson & Johnson booster dose at least 4 months ago
• Age 50 and older and received their initial booster dose at least 4 months ago

See additional recommendations for people who are moderately to severely immunocompromised.