Tom.G said:
re post #5090 above by
@atyy
From the figure on page 24 of the article, it looks like they can stop looking for Wuhan lab creation.
If I read it right, the figure seems to show there is/was a common progenitor to the Bat and the Human versions.
That's conjectured. I think the lab creation or accidental lab release can be assigned a very low probability for a few reasons.
The reasons against lab creation are given in
https://www.nature.com/articles/s41591-020-0820-9. Additionally, the Wuhan Institute (WIV) reports that although it has "isolated live" viruses, these have only about 80% similarity to SARS-CoV-2. The virus with the closest sequence is RaTG13 (about 96%), also in the samples of the WIV. The 96% similarity is too far for RaTg13 to be the direct ancestor of SARS-CoV-2 (
estimated about 30 or more years apart), but one may consider the exotic possibility that WIV did experiments on RaTG13 and hastened the evolution. However, that is unlikely because the WIV reports that it did not have RaTG13 "isolated live".
Another possibility that can be considered is that SARS-CoV-2 was among their samples, and although not isolated live, did infect one of their staff. For example, they collected many viral samples, including RaTG13, from a cave, because in 2012 some workers who were preparing the cave for copper mining got sick with pneumonia potentially due to an unknown virus. So while the WIV staff collected the samples or handled them, they may have gotten infected in a similar way as conjectured for the workers. However, this possibility is also unlikely based on WIV reports that they had tested their staff for antibodies against SARS-CoV-2, and there was no evidence of any previous infection. Incidentally, after the discovery of SARS-CoV-2, they went back to serum samples from the mining workers who were conjectured to have been infected with an unknown virus to check if that conjectured virus could have been SARS-CoV-2, and it was not.
The above information about the WIV was drawn from an interview with Shi Zhengli, as well as an addendum to her group's paper on RaTG13.
https://science.sciencemag.org/content/369/6503/487.summary
https://www.sciencemag.org/sites/default/files/Shi%20Zhengli%20Q&A.pdf
https://www.nature.com/articles/s41586-020-2951-z
The same information is in the WHO report on SARS-CoV-2 origins, with a little extra detail.
https://www.who.int/publications/i/...bal-study-of-origins-of-sars-cov-2-china-part
"The three laboratories in Wuhan working with either CoVs diagnostics and/or CoVs isolation and vaccine development all had high quality biosafety level (BSL3 or 4) facilities that were well-managed, with a staff health monitoring programme with no reporting of COVID-19 compatible respiratory illness during the weeks/months prior to December 2019, and no serological evidence of infection in workers through SARS-CoV-2-specific serology-screening."
The WHO report says the lab release theory is unlikely, but it does not rule out revisiting the lab release theory if more evidence comes to light.
"What would be needed to increase knowledge? Regular administrative and internal review of high-level biosafety laboratories worldwide. Follow-up of new evidence supplied around possible laboratory leaks."