I've heard once that a virus can be carbon dated. Not sure if it is true or not, however, and the story told after that statement went something like this...
Imagine a truck load of different animals in cages that are stacked upon one another(not uncommon in Wuhan). The chickens known to have high immune systems are carrying the virus, below the chicken cage is a cage of ferrets(known to have weak immune systems). Chicken's poop into the ferret cage, a new strand develops from the ferrets being exposed, later gets into humans. The end.