Viruses are named based on their genetic structure to facilitate the development of diagnostic tests, vaccines and medicines. Virologists and the wider scientific community do this work, so viruses are named by the International Committee on Taxonomy of Viruses (ICTV). Where did the COVID-19 come from? Experts say SARS-CoV-2 originatedRead More →

COVID-19 vaccines are not interchangeable. If you received a Pfizer-BioNTech or Moderna COVID-19 vaccine, you should get the same product for your second shot. You should get your second shot even if you have side effects after the first shot, unless a vaccination provider or your doctor tells you notRead More →

Based on what we know from similar viruses, some reinfections are expected. We are still learning more about COVID-19. How much more contagious is the Delta variant of COVID-19? • The Delta variant is more contagious: The Delta variant is highly contagious, more than 2x as contagious as previous variants.Read More →

1. The Moderna COVID-19 Vaccine is authorized for use in individuals 18 years of age and older. Should fully vaccinated international travelers be tested for COVID-19? Fully vaccinated international travelers arriving in the United States are still recommended to get a SARS-CoV-2 viral test 3-5 days after travel. Fully vaccinatedRead More →