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Histoplasma capsulatum is a dimorphic fungus found in areas of endemicity around the world, notably in river basins. It lives in soil, especially where there are high quantities of bird or bat droppings; when disturbed, its conidia become airborne and can be breathed. Frequently, infections are asymptomatic, but in immunocompromised people, histoplasmosis can become widespread, resulting in significant morbidity and death.