Mystery deepens over animal source of coronavirus - Nature Feb 26
"Pangolins are a prime suspect, but a slew of genetic analyses has yet to find conclusive proof."
"Not close enough
...The researchers said they had found a coronavirus in smuggled pangolins that was a 99% genetic match to the virus circulating in people.
But the result did not actually refer to the entire genome. In fact, it related to a specific site known as the receptor-binding domain (RBD), say the study’s authors, who posted their analysis1
on the biomedical preprint server bioRxiv on 20 February. The press-conference report was the result of an “embarrassing miscommunication between the bioinformatics group and the lab group of the study”, ...
A whole-genome comparison found that the pangolin and human viruses share 90.3% of their DNA.
Three similar comparison studies were posted on bioRxiv last week. One of those papers — by an international research group , posted on 18 February — found that coronaviruses in frozen cell samples from illegally trafficked pangolins shared between 85.5% and 92.4% of their DNA with the virus found in humans.
Two other papers published on 20 February, from groups in China, also studied coronaviruses from smuggled pangolins. The viruses were 90.23% and 91.02% similar, respectively, to the virus that causes COVID-19."
So clues, but no definitive answers yet.