Coccidioides immitis (C. immitis) (C. immitis)

Coccidioides immitis is a soil-dwelling, dimorphic fungus that serves as a primary causative agent of coccidioidomycosis, also known as Valley Fever [CDC: Coccidioidomycosis]. Endemic to the southwestern United States, particularly California, the organism exists as a mold in the environment and transforms into a specialized structure called a spherule upon inhalation into the mammalian lung [PubMed: 29155684]. This transition is critical for its pathogenicity, as spherules release endospores that disseminate the infection within the host. Therapeutic intervention typically involves systemic antifungal medications that target fungal-specific pathways, such as ergosterol biosynthesis or cell membrane stability [StatPearls: NBK448161]. Management of C. immitis infections is often challenging due to the potential for chronic or disseminated disease, requiring long-term monitoring and treatment. While it is a major clinical target for therapy, it is classified as a biological pathogen rather than a single molecular receptor or enzyme.

Other names

Valley Fever fungusCalifornia CoccidioidesCoccidioides immitis

Antifungal agents targeting this organism primarily act by inhibiting the synthesis of ergosterol via the inhibition of lanosterol 14-alpha demethylase (azoles) or by binding directly to ergosterol in the fungal cell membrane to increase permeability and cause cell death (polyenes) [StatPearls: NBK448161].