Pfizer-BioNTech Covid-19 Booster Shot Was 95.6% Effective in Large Trial, Companies Say

Pfizer-BioNTech Covid-19 Booster Shot Was 95.6% Effective in Large Trial, Companies Say

The study was carried out while the highly contagious Delta variant was prevalent, the companies said, suggesting the booster helps protect against the contagious strain.

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