The steep fall began before significant vaccine deployment.
I suspect herd immunity has kicked in.
No, we’re on the down side of the bell curve that we’ve seen three times in the US and multiple times in every country around the world. We had a big jump during the holidays and that’s ending.
The vaccines will show a serious impact by around June with actual herd immunity (Rt < 1) sometime in July. Either way, the fat lady’s warming up to sing.
I suspect it was the criteria for diagnosing... finally requiring symptoms. That motorcycle accident resulting in decapitation would. No longer be counted.
Fully Crediting for herd immunity equals the dems repeating this every time they want something. It also equals the buy of the lie.
Herd immunity argument is well proved by examining CA Vs FL.
CA is all closed up, FL is all open. Floridians acquired immunity faster by exposure. CA people isolated and no chance to develop natural immunity vis exposure. Mortality rate in FL is lower than CA!