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  1. Feature Article — COVID-19 Vaccine: What’s in the Vial?

  2. Pfizer COVID-19 Vaccine Summary | Vaccines & Immunizations

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

  4. Preparing Vaccines for Administration | CDC - Centers for Disease ...

  5. How the Pfizer-BioNTech Vaccine Works - The New York Times

  6. Spikevax (COVID-19 Vaccine, mRNA) 2024-2025 Formula - Moderna

  7. How Pfizer Makes Its Covid-19 Vaccine - The New York Times