Single most likely diagnosis:
- Accidental entry of a bat into the house through an open window or door. This is the most common reason a bat would be found inside a house, as bats are nocturnal and may accidentally fly into homes while chasing insects or seeking shelter.
Other Likely diagnoses:
- Bats roosting in the attic or walls of the house. Bats often roost in dark, secluded areas, and attics or wall voids can provide ideal conditions for them.
- Bats entering the house through a gap or hole in the structure. Bats can squeeze through very small openings, so even tiny gaps around vents, chimneys, or windows can allow them to enter.
Do Not Miss (ddxs that may not be likely, but would be deadly if missed.):
- Rabies exposure. Although rare, bats can carry rabies, and if someone in the house has been bitten or scratched by the bat, prompt medical attention is crucial to prevent the disease.
- Histoplasmosis. Bat droppings can contain the fungus that causes histoplasmosis, a serious lung infection. Inhaling spores from contaminated droppings can lead to this condition.
Rare diagnoses:
- Intentional introduction of a bat into the house. This could be due to someone bringing a bat into the house for various reasons, such as for study, as a pet, or as part of a prank.
- A bat being trapped inside the house during a renovation or sealing project. If a bat was inside the house when renovations or sealing work was being done, it could become trapped inside.