Bats don't get sick from most viruses.
Why it is true
Bats have many genes responsible for antiviral activity, keeping them safe. They can carry and spread viruses without getting sick.
Source: Cell Journal / Boston University
Would you rather be asked first?
This is the reading side of the site, so the answer is in the sentence above — that is the whole point of it. Test yourself works the other way round: the question comes on its own, and the fact and the explanation only appear once you have answered.