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The mild thing seems very contextual, it's less severe than delta but equally or more severe than alpha was the last analysis I read
And the added confusion comes from the fact Omicron appears to be very close to as severe as Delta in the immune naive, thankfully a small cohort for us but a bit of a worry for large tracts of the world.
Edit: Although a couple of recent preprints have suggested that it might be more significantly less severe in immune naive people than Delta, but at the moment the weight of the early evidence is that its quite similar.
The mild thing seems very contextual, it's less severe than delta but equally or more severe than alpha was the last analysis I read