-
an unproven hypothesis
Not for me to say. But Jared Diamond seems happy to stake his reputation on it.
Vox made this explanation, but admits it's not yet conclusive. Vox can be a bit sensational, but my impression is that their fact checking is decent.EDIT: Neither source says bats in particular, just go a long way to suggest an animal origin.
My point being the same though. Why would be become immune to something that animals did not manage to fight off?
starfish&coffee-
We don't know which animal it came from yet so we don't know how their immune systems have responded.
The source of H1N1 from ten years ago still hasn't been established so we might be waiting a long time before we know for sure where this came from.
The only reason we know it came from an animal is because its an animal based group of viruses and humans are animals.
EDIT: From what I have read, the only reason people are suspecting bats for this virus is because people are starting to suspect (but not yet proven) that bats were behind the last SARS epidemic in 2002. In short, nobody knows.
Stonehedge
I thought that the bat thing was only an unproven hypothesis? I.e nobody knows for sure where this virus came from.