No, they do not. Bats in generally do not produce venom that is hazardous or threatening in any way to humans.
The closest thing to any form of ‘poison’ or harm is the saliva from a vampire bat, which has an anticoagulant effect and prolongs bleeding so the bat can continue to drink blood.
Do note that a very small percentage of bats (less than 1%) may carry rabies which may be spread to humans through scratches and bites.
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