Omicron v. delta: Battle of coronavirus mutants is critical

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A researcher said that South Africa had such low numbers of delta cases when omicron emerged, “I don’t think we can say” it out-competed delta.

A woman is vaccinated against COVID-19 at the Hillbrow Clinic in Johannesburg, South Africa, Monday Dec. 6, 2021. South African doctors say the rapid increase in COVID-19 cases attributed to the new omicron variant is resulting in mostly mild symptoms.

“It’s still early days, but increasingly, data is starting to trickle in, suggesting that omicron is likely to outcompete delta in many, if not all, places,” said Dr. Jacob Lemieux, who monitors variants for a research collaboration led by Harvard Medical School. Many critical questions about omicron remain unanswered, including whether the virus causes milder or more severe illness and how much it might evade immunity from past COVID-19 illness or vaccines.

But Hanekom, who is also co-chair the South African COVID-19 Variants Research Consortium, said South Africa had such low numbers of delta cases when omicron emerged, “I don’t think we can say” it out-competed delta.

 

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