The Fungus Among Us: Latency, Reactivation, and the Expanding Clinical Spectrum of Coccidioidomycosis

Coccidioidomycosis is a serious fungal infection that can produce a wide range of clinical manifestations, from mild, self-limiting pulmonary disease to severe, disseminated infection that can involve nearly any organ system, including the skin. Coccidioidomycosis may also affect patients at the psychiatric level. Its clinical relevance has increased markedly in recent years, as incidence continues to climb, geographic distribution widens, and emerging presentations challenge traditional assumptions regarding fungal latency and host immunity. A notably important and developing area of study is the concept of late reactivation. A narrative review of the literature was conducted using PubMed, MEDLINE, and Google Scholar. Search terms included coccidioidomycosis, Coccidioides, latency, reactivation, disseminated disease, serology, climate change, and fungal epidemiology, among others. Priority was given to peer-reviewed reviews, clinical guidelines, epidemiologic studies, and case series. Growing evidence indicates that Coccidioides can persist in a latent state for many years or even decades after apparent clinical recovery, with the potential to reactivate under conditions of declining host immunity or other physiological stressors. Diagnostic tools are currently inadequate to reliably differentiate latent infection from complete eradication, and no validated biomarkers are available to predict the risk of reactivation. Neuropsychiatric and dermatologic manifestations are underrecognized yet clinically important aspects of the disease burden. Coccidioidomycosis remains a complex and difficult condition to manage. This literature review seeks to highlight existing gaps in the literature and to promote further research on this disease.