Covid-19: Omicron is causing more infections but fewer hospital admissions than delta, South African data show Owen DyerData from South Africa's largest private health insurer suggest that omicron is spreading faster than any previous coronavirus variant and showing signs of immune escape, with both vaccinated and previously infected people more at risk than in previous waves.More than 90% of newly sequenced infections in South Africa now involve the omicron variant, and as it displaced delta, vaccine effectiveness dipped, revealed data presented by the insurer Discovery Health at a 14 December briefing.
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Owen Dyer (2021) studied this question.