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  1. Pfizer–BioNTech COVID-19 vaccine - Wikipedia

  2. Pfizer-BioNTech COVID-19 Vaccine COMIRNATY® Receives Full …

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

  4. Pfizer-BioNTech COVID-19 Vaccine | FDA

  5. Staying Up to Date with COVID-19 Vaccines | COVID-19 | CDC

  6. FDA Approves First COVID-19 Vaccine

  7. The Pfizer BioNTech (BNT162b2) COVID-19 vaccine: What you …

  8. Pfizer and BioNTech Receive Positive CHMP Opinion for Omicron …

  9. How the Pfizer-BioNTech Covid-19 Vaccine Works - The New York Times