A/The big unknown for Omicron is the magnitude of reduction in illness severity compared with Delta and prior variants. The South African preprint data today says 70%, adjusted. In a population with high Covid exposure, https://t.co/CSV9HPO4vm Much more still to learn on this.... pic.twitter.com/fJUTsG5KwW

— Eric Topol (@EricTopol) December 21, 2021