Biotechnology firm Moderna announced Monday that a preliminary analysis shows its experimental coronavirus vaccine is nearly 95 percent effective at preventing illness, including severe cases — a striking initial result that leaves the United States with the prospect that two coronavirus vaccines could be available on a limited basis by the end of the year.
“It’s extremely good news. If you look at the data, the numbers speak for themselves,” said Anthony S. Fauci, director of the National Institute of Allergy and Infectious Diseases, who was one of three people briefed on the data by an independent committee Sunday morning. “I describe myself as a realist, but I’m fundamentally a cautious optimist. I felt we’d likely get something less than this. … I said certainly a 90-plus-percent effective vaccine is possible, but I wasn’t counting on it.”
Moderna’s vaccine, co-developed with Fauci’s institute, is being tested in 30,000 people. Half received two doses of the vaccine, and half received a placebo. To test how well the vaccine works, physicians closely monitored cases of covid-19 to see whether they predominantly occurred in people who received the placebo group.
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