Worldwide coronavirus cases passed 100 million Wednesday as countries struggle with new variants of the virus and a limited supply of vaccine. The worst-affected countries include the United States, India, Brazil and those in Europe. More than 2.1 million people have died from COVID-19, based on information from the Johns Hopkins University Coronavirus Center. At this time, the U.S. Centers for Disease Control and Prevention (CDC) says there is no evidence that new coronavirus variants cause more severe illness or increased risk of death. However, the CDC adds that scientists are still working to understand how easily the new forms might spread. They also want to find out whether they might cause more severe illness or whether currently approved vaccines will protect people against them. Three of the new coronavirus variants were found to have come from three countries: Britain, South Africa and Brazil.