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  1. May 20, 2021 · In two cohort studies among HCP, the single-dose effectiveness of the Pfizer-BioNTech vaccine was consistent with the estimates in this report, with 72% effectiveness (95% CI = 58%–86%) 21 days after the first dose in a U.K. study (7) and 80% effectiveness (95% CI = 59%–90%) ≥14 days after the first dose in a U.S. cohort study (6 ...

    • Tamara Pilishvili, Katherine E. Fleming-Dutra, Jennifer L. Farrar, Ryan Gierke, Nicholas M. Mohr, Da...
    • 2021
  2. 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.

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  4. Jan 15, 2021 · 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...

  5. Dec 8, 2020 · In November, Pfizer said early results from its Phase 3 clinical trials showed that two doses appeared to be 95 percent effective in preventing symptomatic Covid-19. The new information shows...

  6. Mar 12, 2022 · A single dose strategy, for both vaccines, was effective at reducing COVID-19 mortality and hospitalization rates. The magnitude of vaccine effectiveness was comparatively lower for SARS-CoV-2 infection, although this was variable across the age range, with higher effectiveness seen with older adults.

    • 10.1016/j.eclinm.2022.101344
    • 2022/04
    • EClinicalMedicine. 2022 Apr; 46: 101344.
  7. Mar 19, 2021 · Another real-world study of adults ages 70 and older conducted by Public Health England in early 2021 determined that a single dose of the Pfizer vaccine was 61% effective at preventing...

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