Health COVID-19 Updates: Delta Variant Now Responsible for 83% of U.S. Cases Posted onJuly 21, 2021July 21, 2021Authorlutra Share on PinterestNoam Galai/Getty Images More than 4 million people have died from COVID-19 globally. More than half of U.S. adults are now fully vaccinated. New COVID-19 cases are on the rise in virtually every U.S. state. Source: healthline