Disseminated Histoplasmosis in Central California Seen in an Immunocompromised Patient

Area of Science:

• Mycology
• Infectious Diseases
• Immunology

Background:

• Histoplasma capsulatum is a fungus endemic to the Americas, causing histoplasmosis via inhaled microconidia.
• Histoplasmosis is usually self-limiting but can disseminate in immunocompromised individuals, leading to significant morbidity.

Observation:

• A case study of a patient newly diagnosed with human immunodeficiency virus (HIV) presenting with disseminated histoplasmosis.
• The patient's symptoms mimicked infectious pulmonary granulomatous disease, with imaging revealing multi-organ involvement.

Findings:

• The patient's disseminated histoplasmosis was diagnosed in Central California.
• Evidence suggests a reactivation of a prior infection acquired in Central America, potentially years earlier.

Implications:

• Highlights the risk of disseminated histoplasmosis in newly diagnosed HIV patients.
• Suggests the possibility of late reactivation of endemic fungal infections in immunocompromised individuals.
• Emphasizes the importance of considering endemic mycoses in differential diagnoses, even in non-endemic areas.