A health worker administers a dose of the Pfizer vaccine in Jerusalem.
  • Pfizer said its booster shot is 95.6% effective against preventing Covid-19 amid the Delta variant.
  • The results were from its first large trial, of more than 10,000 people aged 16 and older.
  • Half of the participants got the third booster dose, and half got a placebo.
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Pfizer said on Monday that its coronavirus booster shot has 95.6% efficacy at preventing Covid-19 amid the Delta variant.

The results were from a randomised, 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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