@edsuom Delta isn't quite extinct. It's lingering at 1% or so. It is possible that some offshoot Delta makes a comeback, particularly as immunity to Delta fades. I wouldn't dismiss it entirely, though less of an immediate concern than the Omicrons.
@edsuom三角洲并没有完全灭绝。它徘徊在1%左右。一些分支三角洲可能会卷土重来，尤其是随着对三角洲的免疫力减弱。我不会完全否定这一点，尽管与Omicrons相比，这不是一个紧迫的问题。