Scientist have been jumping through their ass to prove that the new SARS-CoV-2 virus did NOT come from a lab. You can see the political bias plain as day. HAHAHAHAHAAA
From the previous paper I outlined, we know scientist were manipulating corona viruses' spike protein to infect human ACE2 receptor cells. This was basically forcing natural selection in the lab to infect humans. We know they did this. They were proud of it and they published papers showing their work.
I found a new paper that is pretty good, so I will outline it here.
https://www.nature.com/articles/s41591-020-0820-9
I'll just jump right to the good parts. You can read this for yourself. Basically what they are saying is. because the spike protein is very good at binding to the humans ACE2 receptor, it is a result of natural selection inside of a human, an animal, or a lab.
"Thus, the high-affinity binding of the SARS-CoV-2 spike protein to human ACE2 is most likely the result of natural selection on a human or human-like ACE2 that permits another optimal binding solution to arise. This is strong evidence that SARS-CoV-2 is not the product of purposeful manipulation."
The possibilities from the paper are,
Natural selection in an animal host before animal to human transfer
Natural selection in humans following animal to human transfer
Natural selection in the lab on human cells before human transfer.
"In theory, it is possible that SARS-CoV-2 acquired RBD mutations (Fig. 1a) during adaptation to passage in cell culture, as has been observed in studies of SARS-CoV-1. The finding of SARS-CoV-like coronaviruses from pangolins with nearly identical RBDs, however, provides a much stronger and more parsimonious explanation of how SARS-CoV-2 acquired these via recombination or mutation19."
HAHAHAHAHAAHAHA, scientist are doing everything they can to divert attention away from the lab origin possibility.
My thinking is that a lab technician infected themselves in the bat caves and then hosted and spread the virus. We may never know.
side note: "SARS-CoV-2 seems to have an RBD that binds with high affinity to ACE2 from humans, ferrets, cats and other species with high receptor homology7."
I saw in the news some cats have been infected with SARS-CoV-2