Take an exclusive look inside a busy Covid-19 vaccine facility
CNN's Dr. Sanjay Gupta goes inside Pfizer's vaccine facility in Michigan to see how the company produces millions of Covid-19 vaccines.
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Virus updates: Pfizer says vaccine protects at least 6 months; Japan fighting rise in cases as Olympics near; Sarah Palin confirms COVID diagnosis, urges mask-wearing.
The U.S. moved closer Thursday toward vaccinating 100 million Americans in a race against an uptick in COVID-19 cases that is fueling fears of another nationwide surge.
