Pfizer COVID-19 booster effective against virus, Delta strain, company says – GLOBAL

October 21, 2021

Pfizer Inc. and German partner BioNTech SE on Thursday said data from a phase three trial demonstrated high efficacy of a booster dose of their COVID-19 vaccine against the virus, including the Delta variant.

They said a trial of 10,000 participants aged 16 or older showed 95.6 per cent effectiveness against the diseases, during a period when the Delta strain was prevalent.

The study also found that the booster shot had a favorable safety profile.

Pfizer had said its two-shot vaccine’s efficacy drops over time, citing a study that showed 84 per cent effectiveness from a peak of 96 per cent four months after a second dose. Some countries had already gone ahead with plans to give booster doses.

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