An (anonymous) blog entry that links to another (anonymous) blog and a tweet. No scientific papers or sources linked.

We should be more critic with respect to what sources of information we read about something as serious as a pandemic.

I agree and I believe that is part of the problem. Nobody has been willing to make a paper on this yet. Apparently there is a lot of discussion in the scientific community but its just that, discussion. I suspect nobody wants to risk their career until they have something more credible to post than speculation and anecdotal observations, albeit very interesting observations.

Or, it evolved in mice, and did a cross-species jump: https://www.biorxiv.org/content/10.1101/2021.12.14.472632v1.

There is also a video discussing this [1] I am curious to see if biologists and virologists can work out a plausible theory.

[1] - https://www.youtube.com/watch?v=-hjFT8XCsH0 [video]