Operation Warp Speed leader says he expects coronavirus vaccine to be highly effective, 'in the 90%' range

Operation Warp Speed leader says he expects coronavirus vaccine to be highly effective, 'in the 90%' range
The head of the government's effort to develop a vaccine against Covid-19 says he expects the vaccine to have efficacy rates "in the 90%" range -- but that there might not be enough vaccine available for all Americans until the end of next year.

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