Omicron cases have thus far been relatively mild. This pattern has fueled the widespread claim that the variant might be less severe, or even that its rapid spread could be a welcome development. “People are saying ‘Let it rip’ and ‘It’ll help us build more immunity,’ that this is the exit wave and everything’s going to be fine and rosy after,” Richard Lessells, an infectious-disease physician at the University of KwaZulu-Natal, in South Africa, told me. “I have no confidence in that.”
To begin with, as he and others told me, that argument overlooks a key dynamic: Omicron might not actually be intrinsically milder. In South Africa and the United Kingdom, it has mostly infected younger people, whose bouts of COVID-19 tend to be less severe.
And in places with lots of prior immunity, it might have caused few hospitalizations or deaths simply because it has mostly infected hosts with some protection.
Also, deaths and hospitalizations are not the only fates that matter. Supposedly “mild” bouts of COVID-19 have led to cases of long COVID, in which people struggle with debilitating symptoms for months (or even years), while struggling to get care or disability benefits.
