Because vampire bats suck blood from cattle and other large animals it is possible that it could get a disease from the blood. If the bat does get a disease it would be possible for it to transmit it from one animal to another. A bat can eat 600 to 800 insects per hour. Most of the insect eating bats live where it's cold. Most fruit eating bats live in warm places.
Meat eating bats are much bigger than insect eating bats.