Valley Fever Center for Excellence


"Leading the world in best medical practices, education and research for Valley Fever."


Valley Fever in People

Valley Fever derives its name from its discovery in the San Joaquin Valley of California, where it was also referred to as "San Joaquin Valley Fever" or "Desert Rheumatism."

The medical name for Valley Fever is coccidioidomycosis (often shortened to "cocci" caused by the fungus Coccidioides spp. (C. immitis, C. posadasii)

Area of Distribution:

  1. Southwestern United States and Northern Mexico.
  2. San Joaquin and Central Valleys of California
  3. Southern Arizona (especially in the Phoenix and Tucson areas).
  4. Southern parts of Nevada, Utah, New Mexico and Western Texas (especially around El Paso)
  5. Mexico (in the states of Sonora and Chihuahua).
  6. Also found in semiarid and arid soils of Central and South America.

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