Scientists greet Pfizer vaccine announcement with optimism

Published on 10 Nov 2020 1:06:20 PM

Scientists on Monday (Nov 9) said initial trial results for Pfizer Inc and BioNTech's coronavirus vaccine far outpaced their expectations for protection against a completely new disease, but that many questions remain unanswered.

The drugmakers said their vaccine was more than 90 percent effective at preventing COVID-19, based on data from the first 94 people in the trial to become infected with the coronavirus.