Bat Guano, Histoplasmosis and Structural Risk

The building problem first

The most reliable damage from a long running roost is to the building. Accumulated droppings and urine soak into insulation and destroy its performance, hold moisture against timber, and stain through ceiling material. That is the cost most homeowners actually meet.

Histoplasmosis in context

Histoplasmosis is a respiratory infection caused by a fungus that can grow in soil enriched by bird or bat droppings. It is a real consideration when disturbing accumulated guano in an enclosed space such as an attic, which is why the work is done with respiratory protection and the area isolated.

It is worth being measured about this. The risk is associated with disturbing accumulated material in a confined space, not with the presence of a bat near a building. If you have specific health concerns, particularly with a compromised immune system, that is a conversation for a physician rather than a pest control company.