Pfizer says its booster shot has 95.6% efficacy against COVID-19 amid the Delta variant

4:59 AM
pfizer booster shot
A health worker administers a dose of the Pfizer vaccine in Jerusalem.

Ahmad Gharabli/AFP/Getty Images

  • Pfizer said its booster shot had 95.6% efficacy against COVID-19 caused by the Delta variant.
  • The results were from its first large trial, of more than 10,000 people aged 16 and older.
  • The study hasn't yet been published or formally scrutinized by other experts.

Fully vaccinated people who received an extra dose of Pfizer's shot in a large trial were at 95.6% lower risk of catching COVID-19 than those who that got a placebo vaccine, the company said Monday.

The results were from a randomized, controlled Phase 3 trial of the booster dose in more than 10,000 individuals aged 16 or older

Pfizer Chairman and CEO Albert Bourla said in the statement: "These results provide further evidence of the benefits of boosters as we aim to keep people well-protected against this disease."

All participants in the trial had already recieved two doses of the Pfizer/BioNTech vaccine. Half of them then got the third booster dose, and half got a placebo.

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