CLOSE The COVID-19 vaccine is using new technology that has never been used before in traditional vaccines. Here’s how an mRNA vaccine works. USA TODAYUSA 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 343,000 Americans since the first reported fatality in February. Keep refreshing this page for the latest updates on vaccine distribution, including who is getting the shots and where, as well as other COVID-19 news from across the USA TODAY Network. Sign up for our Coronavirus Watch newsletter for updates directly to your inbox, join our Facebook group or scroll through our in-depth answers to reader questions for everything you need to know about the coronavirus.In the headlines:► Republican Sen. David Perdue announced Thursday that he was quarantining after coming into contact with someone on his campaign who tested positive for COVID-19, a striking development just five days before voters decide his political fate in a runoff race in Georgia. Perdue’s campaign said the Georgia Republican and his wife both tested negative for the virus Thursday but were going to quarantine. ► California on Thursday surpassed 25,000 coronavirus deaths since the start of the pandemic, the third state to do so after New York and Texas, health

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