South Africa study suggests Omicron could displace Delta
Hospital stay risk for Omicron is 40%-45% lower than Delta, UK study says
Kamala Harris concedes White House didnt see Delta and Omicron coming
Delta variant fuels US pandemic; southern states nearly out of ICU beds
US plunged into confusion over masks as country hit by Delta
Biden hints at new COVID restrictions as Delta infections rise
Delta flight dumps fuel on Los Angeles school, 26 treated for minor injuries