Pfizer, BioNTech say Covid-19 booster shot showed high efficacy in large study

A booster dose of the Covid-19 vaccine developed by Pfizer Inc and German partner BioNTech SE was 95.6 percent effective against the coronavirus when compared to a vaccinated group that did not get the third shot, data from a large study released by the companies showed on Thursday.

The companies in a release said the booster was tested on 10,000 participants...