Or maybe it was in humans a bit before it took off. I see Daszak's kind of changed his tune a bit these days to not mention anything like that lab stuff.
I mean stability in that the sequence of the virus is much the same as it was a month before. That's not true when a virus jumps species - they evolve rapidly to the new species.
It was actually remarkably stable in the early days suggesting it was used to reproducing in human cells. Or so Professor Petrovsky says https://www.dailymail.co.uk/news/article-8356751/How-COVID-1...
As how that could have happened lab wise here's Daszak saying they routinely infect human cells with coronavirus in the lab https://www.youtube.com/watch?t=1701&v=IdYDL_RK--w&feature=y...
Or maybe it was in humans a bit before it took off. I see Daszak's kind of changed his tune a bit these days to not mention anything like that lab stuff.