The Food and Drug Administration authorized Pfizer’s Covid-19 vaccine for emergency use on Friday, clearing the way for millions of highly vulnerable people to begin receiving the vaccine within days.
The authorization was signed by the agency’s chief scientist on Friday evening, according to three people with knowledge of the decision who spoke on condition of anonymity because they were not authorized to discuss it.
Throughout the hard-hit states of the upper Midwest and northern Plains — in Illinois, Wisconsin, Iowa, Minnesota, Montana, Wyoming and the Dakotas — coronavirus case counts have been falling for weeks.
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