Histoplasmosis in Idaho and Montana, USA, 2012–2013

To the Editor: Histoplasmosis occurs after infection with the dimorphic fungus Histoplasma capsulatum (1–6). Patients become ill after they inhale soil contaminated with H. capsulatum (1,2). Most infections are asymptomatic or result in mild illness not determined to be histoplasmosis (1,2). Symptoms usually develop 3–14 days after exposure and range from self-limited pneumonia to severe disseminated disease requiring antifungal therapy (2,7).