Why two doses?
Both the Pfizer and Moderna vaccines require two doses. The first dose helps the immune system create an initial response against COVID-19. The second dose strengthens the immune response to ensure longer-term protection.
Both doses of the COVID-19 vaccine must be from the same brand (Pfizer or Moderna). It is very important to get two doses, so your body develops the most protection to fight the COVID-19 virus.
Post-vaccination Health Checker
Vaccine recipients can sign up for V-safe, a free smartphone-based tool from the CDC that uses text messaging and web surveys to provide personalized health check-ins after you receive a COVID-19 vaccine. V-safe allows you to report side effects from the vaccine, and you may be contacted by the CDC for more information depending on your answers.