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.