Fungal infection by Coccidiodes Immitis - see this program. Usually respiratory, and can involve fever, muscle/joint pain, rash/lesions, and headache.Encyclopedia Entry for Coccidioidomycosis :Coccidioidomycosis - San Joaquin Valley fever, desert rheumatism, Posada-Wernicke disease- Coccidioides immitis (dimorphic fungus).Encyclopedia Entry for Coccidioidomycosis :Coccidioidomycosis. Source of disease: Coccidioides immitis and Coccidioides posadasii