While bats are beneficial creatures overall, they do pose certain health threats. Diseases like rabies and histoplasmosis are often associated with bats. Though 99 percent of rabies-related deaths are caused by rabid dogs, bats are still carriers of the disease. Thankfully, even rabid bats refrain from biting humans unless they feel threatened in some way.
One of the biggest risk from a bat infestation is bat guano. The accumulation of guano can stain ceilings, walls, and floors. Left unchecked, guano can also lead to structural damage in your attic.