Pfizer Shot Remains More Than 91% Effective After Six Months

The Pfizer Inc.-BioNTech SE vaccine remained highly effective against Covid-19 after six months, according to new long-term results that Pfizer said could be used to seek an expansion of the shot’s regulatory status. Follow-up data from a final-stage trial of 46,307 people showed the vaccine was 91.3% effective in preventing […]