Coronavirus live updates: On first day of 2021, US records its 20 millionth case; Sen. David Perdue quarantines; calm NYE in Times Square Cara Richardson and Jessica Flores, USA TODAY How a new type of vaccine called mRNA is changing the game to prevent COVID-19 Replay Video UP NEXT USA TODAY is keeping track of the news surrounding COVID-19 as a pair of vaccines join the U.S. fight against a virus that has killed more than 345,000 Americans since the first reported fatality in February. Keep refreshing this page for the latest updates surrounding the coronavirus, including who is getting the vaccines from Pfizer and Moderna, as well as other top news from across the USA TODAY Network. Sign up for our