Omicron apparently less severe than delta. http

Omicron apparently less severe than delta.

https://www.nytimes.com/2021/12/06/world/afri...pread.html

Quote:

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Researchers at a major hospital complex in Pretoria reported that their patients with the coronavirus are much less sick than those they have treated before, and that other hospitals are seeing the same trends. In fact, they said, most of their infected patients were admitted for other reasons and have no Covid symptoms.

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Who is surprised that a variant potentially emerging from an immune compromised host is less virulent than variants evolved among the immune competent?

A great reminder that mutation does not necessarily increase virulence.