Omicron subvariant causes uptick in U.S. COVID cases Omicron subvariant causes uptick in U.S. COVID cases Omicron subvariant causes uptick in U.S. COVID cases Washington — The Centers for Disease Control and Prevention (CDC) said Wednesday it will extend its nationwide mask requirement for passengers on planes and public transportation through May 3, citing the need to assess the impact of a new coronavirus variant that is driving most COVID-19 infections in the U.S. The mask mandate was set to expire April 18, but the Biden administration will keep the requirement in place for anothe . . . read the full article here.