SARS-CoV-2 is a positive-sense single-stranded RNA virus. It is contagious in humans and is the cause of the coronavirus disease 2019 (COVID-19). Non-active site mutations such as L50F are crucial ...

Play the USA TODAY Daily Crossword Puzzle. "You made I, Chloe Fineman, burst into tears because I stayed up all night writing a sketch, I was so excited, I came in, I asked if you had any ...

You made I, Chloe Fineman, burst into tears because I stayed up all night writing this sketch,” she said. “I was so excited, I came in, I asked if you had any questions, and you stared at me ...