Scientists are struggling to explain the major, ongoing drop in Covid cases nationwide, with experts pointing to a variety of explanations including possible herd immunity, compliance with mitigation orders and rising vaccination rates as possible causes.
Monday's roughly 53,500 new cases represented a 75% drop from the 213,239 cases observed on Christmas Eve.
Cause for major drop uncertain The welcome news has nevertheless been perplexing for many scientists who are struggling to explain why Covid cases are plunging so sharply.
Then-CDC Director Robert Redfield in June of last year claimed that, based on serological evidence, infection rates were actually 10 times higher than positive case numbers.
One question left unresolved by such claims is why such mitigation measures would have started to work only after nearly three months of skyrocketing case rates.
Some experts have argued that Americans likely changed their behavior at the tail-end of the holidays, leading to the drop in cases.
"If you look at mobility data the week after Thanksgiving and Christmas, activity went down." National mobility data actually indicate a relatively modest decline in travel throughout the U.S. after the holidays, complicating the effort to cite such behavior in explanation of the unprecedented drop in cases.
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Wednesday, March 3, 2021
'Hard to explain': Scientists struggle to figure out plunging COVID cases
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