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What is Valley Fever? Valley Fever (medical name coccidioidomycosis or “cocci” for short) is an infection in the lungs caused by the fungus coccidioides spp., which grows in soils in areas of low rainfall, high summer temperatures and moderate winter temperatures, such as: throughout Arizona, the San Joaquin and Central Valleys of California, Southern parts of Nevada, New Mexico and Western Texas, East-central Utah, south-eastern Washington, and the Semiarid and arid soils of Central and South America.

Valley Fever 2014 Annual Report | Arizona Department of Health Services

Mayo Clinic