It had to go through a mutation to transfer to humans, and then another mutation for human to human transmission
Not sure about human to animal transmission but seems like it would go through the same process
What makes me nervous is that it originated in bats, mutated to transfer to humans, then mutated to transfer to tigers. All mammals, but all distinct species. The question to me is: how many times can this thing mutate? After it has lived within tigers, could it return to humans in a different form?