Coccidioidomycosis is a fungal infection mainly isolated to the lung that arises with inhaling the airborne spores of the Coccidioides fungi. It is also known as valley fever and is a common infection among people who live in endemic areas. Coccidioidomycosis is often asymptomatic and when people living in endemic areas develop the infection, it is usually acute. However, some patients do develop a very severe infection that can be chronic. Coccidioidomycosis is a relatively common cause of death in AIDS patients living in endemic regions, especially if the appropriate treatment is not forthcoming.