Pfizer and its partner, the German company, BioNTech, announced preliminary results that suggested their vaccine was more than 90 percent effective. The news — the first results from any late-stage vaccine trial — buoyed stock markets and spirits as the public saw a glimmer of hope. Here’s what we know, and don’t know, about the vaccine. In July, Pfizer and BioNTech initiated a late-stage clinical trial on a coronavirus vaccine. Half of the people got the vaccine, while the other half got a placebo of salt water.

Source: International New York Times November 09, 2020 19:52 UTC