There is also a high risk that now, when it's solidly established itself in humans This has already been the case for a long time, maybe forever? It's endemic

There is also a high risk that now, when it's solidly established itself in humans This has already been the case for a long time, maybe forever? It's endemic in parts of Africa, just never managed to gain much of a foothold outside that area. But even without that movement, the petri dish for such mutations has been open for business for quite a while.