The total number of coronavirus passed 10 million globally on Sunday, according to data collected by Johns Hopkins University. The U.S., Brazil, Russia and India have reported the most cases. COVID-19 has also killed nearly 500,000 around the world, and more than 125,000 Americans, in the six months since it was first detected in Wuhan, China. Experts believe the number of cases in the U.S. alone could be as high as 20 million because of limited testing and missed mild cases.