No animal is a natural carrier of rabies. Some bats can carry rabies the way a skunk, fox or human can. (That's known as being a 'vector') They get sick and eventually die, but in the meantime, can spread it. Some animals die relatively quickly after becoming infectious, some take longer, and some animals, we don't know how long it takes.

There's a 10-day 'quarantine' on unvaccinated dogs and cats that bite someone because they will die within that 10 day period. Then their brains are examined for signs of rabies. The bitten person will have started shots before the results are known.

Rabies is spread through saliva. Other infectious body fluids may do it, but it's usually saliva, because it gets through the skin via through a bite.

Back to bats. Most of them are just fine. They get the bad rap because if you happen to be bitten by the one bat out of ten thousand (POOP*) that has rabies and you blow it off until months later you start being light-sensitive and having throat spasms, rapidly lose any marbles you might have until you rave and scream yourself into a coma... and then you die.

In short, most bats are fine, but rabies is serious. Don't get bitten, but if you do, capture the bat or save the dead one and GET THEE TO A DOCTOR. If it didn't bite you or spit in your eyeball, you shouldn't have any problem.

Honestly, the best way to get a bat that's flown in your open window out of your bedroom is to leave the window open and maybe pull curtains out of the way.

*POOP= 'Pulled Out Of Posterior'