The research, by the Nationwide Institute of Communicable Ailments (NICD) within the Western Cape area, which has not but been peer-reviewed, concluded.in contrast about 11,600 sufferers from the primary three COVID-19 waves with about 5,100 from the Omicron-driven wave that started in November.
Omicron globally has tended to trigger much less extreme illness, and proportionally fewer hospital admissions and deaths, than earlier variants.
Scientists try to find out the extent to which that is due to larger immunity charges engendered by vaccination or previous sickness, or Omicron is intrinsically much less nasty.
The research concluded that a couple of quarter of the diminished threat of extreme illness with Omicron was attributable to traits of the virus itself.
“Within the Omicron-driven wave, extreme COVID-19 outcomes had been diminished principally resulting from safety conferred by prior an infection and/or vaccination, however intrinsically diminished virulence might account for an roughly 25% diminished threat of extreme hospitalisation or dying in comparison with Delta,” the research stated.