Coccidioidomycosis, commonly called valley fever, is a fungal infection of the lungs that can cause serious problems.

The fungus that causes valley fever is found in the soil, most commonly in the southwestern United States, Mexico, and parts of Central and South America. The fungus lives in the soil, but it is transported through the air and into the lungs, where it infects people who breathe it in. When soil that contains the fungus is disturbed, spores are released into the air.

The disease cannot be transmitted from person to person.