Educational Content: This article is for informational purposes only and does not constitute medical advice. Always consult a healthcare provider for diagnosis and treatment.
Definition of Valley fever
Medically reviewed by Min Clinic Staff | Updated: January 2026
Valley fever: Lung infection with the fungus Coccidioides immitis. The fungus is common in the sands of the deserts of the southwest, including the San Joaquin valley in California, after which it was named. Also called coccidiomycosis.