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Study suggests Omicron less severe even for unvaccinated

Omicron globally has tended to cause less severe disease, and proportionally fewer hospital admissions and deaths, than previous variants.

Scientists are trying to determine the extent to which this is because of higher immunity rates engendered by vaccination or past illness, or Omicron is intrinsically less nasty.

The study concluded that about a quarter of the reduced risk of severe disease with Omicron was attributable to characteristics of the virus itself.

“In the Omicron-driven wave, severe Covid-19 outcomes were reduced mostly due to protection conferred by prior infection and/or vaccination, but intrinsically reduced virulence may account for an approximately 25% reduced risk of severe hospitalisation or death compared to Delta,” the study said. 

Reuters



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