Vaccine recommendations are different depending on your age, the vaccine you first received, and time since last dose. CDC has COVID-19 vaccine recommendations people who are moderately or severely immunocompromised based on those factors.
For primary and booster vaccination, people should receive an age-appropriate mRNA vaccine (Pfizer or Moderna). The Johnson & Johnson vaccine is authorized for anyone age 18 and older if no other approved vaccine is available.
A patient’s clinical team is best positioned to determine the appropriate timing of vaccination. The recommended COVID-19 vaccination schedule from the Centers for Disease Control and Prevention has guidance based on age and medical condition.