evidence: Guidance for adults who have had a COVID-19 vaccine before [...] - Get 1 dose of the 2024-2025 Moderna or Pfizer-BioNTech COVID-19 vaccine, or - Get 2 doses of the 2024-2025 Novavax COVID-19 vaccine at least 3 weeks apart [...] If you have had a COVID-19 vaccine before, get 1 dose of the 2024-2025 Moderna, Pfizer-BioNTech, or Novavax vaccine. You may also be eligible to get additional doses of one of these vaccines. Ask your provider how many doses they recommend for you.