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  1. FDA Approves and Authorizes Updated mRNA COVID-19 Vaccines

  2. Different types of COVID-19 vaccines: How they work

  3. Understanding COVID-19 mRNA Vaccines - National Human …

  4. Comparing the differences between COVID-19 vaccines

  5. FDA Approves First COVID-19 Vaccine

  6. What’s Different About Messenger RNA (mRNA) Vaccines for COVID-19?

  7. Get the facts about COVID-19 vaccines - Mayo Clinic

  8. COVID-19 Vaccines | FDA - U.S. Food and Drug Administration

  9. Advances in COVID-19 mRNA vaccine development - Nature

  10. Efficacy and Safety of the mRNA-1273 SARS-CoV-2 Vaccine