Booster shot of COVID-19 vaccine developed by Pfizer/BioNTech can restore โ€œfull protectionโ€ from the virus, a study claimed.

Booster shot of the anti-COVID-19 vaccine developed by Pfizer/BioNTech has 95.6 percent efficacy, trial data published by the vaccine makers claimed.

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The fast-spreading delta variant was the predominate strain during the trial.

The clinical phase three trial with โ€œ10,000 participants 16 years of age and olderโ€ showed โ€œa relative vaccine efficacy of 95.6 percent against disease during a period when Delta was the prevalent strainโ€, the companies said in a statement.

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โ€œWe believe boosters have a critical role to play in addressing the ongoing public health threat of this pandemic,โ€ Pfizer Chief Executive Officer Albert Bourla said.

Several countries have already approved Covid-19 booster shots to increase immunity in people who have already been vaccinated, but whose protection may have dipped after several months, per some studies.