(CNN)Pfizer and BioNTech on Friday submitted to the US Food and Drug Administration for emergency use authorization for their coronavirus vaccine candidate.This is the first coronavirus vaccine to seek regulatory clearance in the United States. “It is with great pride and joy and even a little relief that I can say that our request for emergency use authorization for our Covid-19 vaccine is now in the FDA’s hands,” Pfizer CEO Albert Bourla said in a video shared on Friday. “This is a historic day, a historic day for science and for all of us. It took just 248 days to get from the day we announced our plans to collaborate with BioNTech to our FDA submission day. “We have operated at extraordinary speed in our clinical development program, from concept to regulatory filing, while always maintaining our focus on safety.”The vaccine, known as BNT162b2, could potentially be available for use in high-risk populations in the United States by the middle to end of December, Pfizer and BioNTech said in a statement earlier Friday. The vaccine requires two doses a few weeks apart, and protection is achieved 28 days after the first shot. The submission to the FDA is based on


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