Pfizer-BioNTech Booster Shot Restores Full Covid Protection (3)

Pfizer Inc. and BioNTech SE said a booster shot of their Covid-19 vaccine restored full protection in a large study, results that are likely to bolster the argument for giving a third dose more widely.

A booster was 95.6% effective against symptomatic Covid in the study, which followed 10,000 people aged 16 and older, the companies said in a statement Thursday. The fast-spreading delta variant was the predominate strain during the trial.

Pfizer shares fell 0.7% as of 10:09 a.m. in New York. BioNTech’s American depositary receipts gained 3.3%.

“We believe boosters have a critical role to play in addressing ...