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It needs to be emphasized that what we’re seeing with SARS-CoV-2 variant evolution now is something new.
https://twitter.com/TRyanGregory/status/1577617059525140480
In the past, we’ve had distinct waves caused by one variant rising quickly in frequency (percentage of infections by that variant) and abundance (total number of infections by that variant), then dropping off. Alpha, Delta, and the Omicron BA.1 and BA.2 waves were like that.