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  1. May 20, 2021 · The first U.S. multisite test-negative design vaccine effectiveness study among HCP found a single dose of Pfizer-BioNTech or Moderna COVID-19 vaccines to be 82% effective against symptomatic COVID-19 and 2 doses to be 94% effective.

    • Tamara Pilishvili, Katherine E. Fleming-Dutra, Jennifer L. Farrar, Ryan Gierke, Nicholas M. Mohr, Da...
    • 2021
  2. According to Pfizer data published in December 2020, the Pfizer-BioNTech vaccine is roughly 52% effective after the first dose. Out of 36,523 participants in the phase three trial – the final ...

  3. Mar 7, 2021 · Research out of Israel published in The Lancet found that the first dose of the Pfizer COVID-19 vaccine was 85% effective two to three weeks after a single dose. Another study found that after one dose of the vaccine, between days 14 to 20, it offered 57% effectiveness for symptomatic COVID-19, 74% for hospitalization, and 62% for severe disease.

  4. Mar 19, 2021 · Soon after the Pfizer COVID-19 vaccine was authorized in December 2020, researchers in Israel found that a single dose was highly effective in one medical center’s thousands of vaccinated health ...

    • William Petri
  5. Apr 19, 2024 · The Pfizer/BioNTech vaccine is the first COVID-19 vaccine ... the Pfizer/BioNTech vaccine was 91% effective in preventing ... old after the second dose of the Pfizer/BioNTech vaccine (105.9 cases ...

  6. Dec 8, 2020 · The efficacy of the vaccine after the first dose is about 52 percent, according to Dr. William C. Gruber, senior vice president of Pfizer Vaccine Clinical Research and Development.

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