Pfizer, BioNTech announce Covid-19 vaccine candidate is 90% effective

U.S pharmaceutical giant Pfizer and German biotech firm BioNTech said their coronavirus vaccine was more than 90% effective in preventing Covid-19 among those without evidence of prior infection, according to data published Monday from their late-stage vaccine trial. CNBC's Meg Tirrell reports.
Mon, Nov 9 20206:59 AM EST