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  1. Oct 5, 2021 · The effectiveness of the Pfizer Inc /BioNTech SE vaccine in preventing infection by the coronavirus dropped to 47% from 88% six months after the second dose, according to data published on...

  2. Jan 12, 2022 · For the Ad26.COV2.S one-dose regimen, vaccine effectiveness reached 85.9% (95% CI, 49.3 to 96.1) at 3 months and was mostly higher than 70% through 6 months, with wide confidence intervals.

  3. Sep 16, 2021 · The first study maintains that despite a gradual decline in efficacy, the Pfizer vaccine remains highly effective in preventing COVID-19, with efficacy declining approximately 6% every two months after an initial peak effectiveness of 96.2%.

  4. Apr 1, 2021 · The topline results from this six-month analysis were shared on April 1, 2021, and the data confirm that the vaccine continues to be safe, well tolerated, and remains highly efficacious in preventing COVID-19, including disease caused by SARS-CoV-2.

  5. Aug 23, 2022 · Updated analysis from 34 cases occurring at least seven days following a three-dose regimen showed 73.2% vaccine efficacy among children ages 6 months through 4 years; The vaccine efficacy remained consistently above 70% in both the 6 through 23 months and the 2 through 4 years age groups

  6. Jul 28, 2021 · Key Points. The efficacy of Pfizer's coronavirus vaccine steadily declines to about 84% about six months after a second dose, according to CEO Albert Bourla. Data from Israel shows the waning...

  7. Apr 1, 2021 · Analysis of 927 confirmed symptomatic cases of COVID-19 demonstrates BNT162b2 is highly effective with 91.3% vaccine efficacy observed against COVID-19, measured seven days through up to six months after the second dose. Vaccine was 100% effective in preventing severe disease as defined by the U.S. Centers for Disease Control and Prevention and ...

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