The study, led by the National Institute of Communicable Diseases, compared 11,609 patients from the first three COVID-19 waves with 5,144 patients from the Omicron-driven wave.
Unvaccinated people infected with the Omicron variant are less likely to fall seriously ill, require hospitalization or die compared to the previous COVID-19 variants, a South African study showed on Friday.in the Western Cape region, compared 11,609 patients from the first three COVID-19 waves with 5,144 patients from the new Omicron-driven wave.
“After adjusting for age, sex, comorbidities and subdistrict there was a substantially reduced hazard of death in wave four compared to wave three,” the study said. Even after prior COVID infections were taken into account, the study found there was roughly a 25 percent reduction in severe hospitalization or death with Omicron than the Delta variant.Only 27 percent of South Africa’s population are fully vaccinated.But scientists have been trying to determine whether the less severe symptoms are because people are now vaccinated or have already had COVID, or if Omicron is naturally more mild.
“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 percent reduced risk of severe hospitalization or death compared to Delta,” researchers said.
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