Histoplasmosis is a disease caused by the fungus Histoplasma capsulatum. The fungus lives in the environment, usually in association with large amounts of bird or bat droppings. Lung infection can occur after a person inhales airborne, microscopic fungal spores from the environment; however, many people who inhale the spores do not get sick. The symptoms of histoplasmosis are similar to pneumonia, and the infection can sometimes become serious if it is not treated.
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