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New York Gov. Andrew Cuomo is holding a press briefing Monday as the country launches the massive rollout of Pfizer‘s Covid-19 vaccine.

Pfizer’s vaccine is the first authorized in the U.S. to prevent the coronavirus, which has killed nearly 300,000 Americans in less than a year.

Now that the country has a vaccine deemed safe and effective by the Food and Drug Administration and the Centers for Disease Control and Prevention, the government must quickly distribute it, a logistically daunting challenge.

Read CNBC’s live updates to see the latest news on the Covid-19 outbreak.