Immunity

Covid-19 Vaccine - Immunity

Below are frequently asked questions related to COVID-19 vaccine immunity. Click on another category to the left to see more FAQs.

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: Yes. When someone who is fully vaccinated tests positive for COVID-19, it is called a “breakthrough” case. Breakthrough cases are expected and relatively common. Oftentimes, vaccinated people who have a breakthrough infection are asymptomatic or have mild symptoms.
: Yes, the U.S. Centers for Disease Control and Prevention (CDC) recommends that everyone 6 months and older get the updated Pfizer-BioNTech or Moderna COVID-19 vaccine, regardless of any previous COVID-19 vaccinations.
Learn more about the vaccine in our COVID-19 vaccine info hub.