Pharmaceutical giant Pfizer, which has a location in Groton, Conn., and its German partner BioNTech began human trials for a COVID-19 vaccine in early May. On Nov. 10, Pfizer reported that the COVID-19 vaccine it is developing showed more than 90 percent effectiveness in late-stage trials.
Dr. Anthony Fauci, the government’s top infectious disease expert, said the results suggesting 90% effectiveness are “just extraordinary,” adding: “Not very many people expected it would be as high as that.” Earlier this year, Fauci said he would be happy with a COVID-19 vaccine that was 60% effective. Scientists have warned for months that any COVID-19 shot may be only as good as flu vaccines, which are about 50% effective and require yearly shots.
Here are 8 things to know about Pfizer and the vaccine: