Apparently the current risk calculus is that if you know you were sleeping in an enclosed area with bats, the vaccine will be recommended, because they can inde

Apparently the current risk calculus is that if you know you were sleeping in an enclosed area with bats, the vaccine will be recommended, because they can indeed occasionally bite relatively painlessly. (Source: I had two friends who slept in a barn and discovered the next day that there were bats living in the barn; they were then given the vaccine even though they didn't feel anything.) It's a weird case of very large numbers being multiplied by very small numbers. Like, you're very unlikely to be bitten by a bat even if you're near one, a given bat is very unlikely to have rabies, if you did somehow get bitten by a rabid bat you're almost certain to die unless you get the vaccine (but the vaccine is almost certain to save you if so), and the vaccine is very expensive (and, in its older formulation, very unpleasant, though much less so more recently). So that's a lot of things that point in all different directions in terms of the decision.