Pulmonary coccidioidomycosis

Abstract

Coccidioidal infection can manifest as pulmonary or extrapulmonary disease. Pulmonary coccidioidomycosis occurs in 95% of all cases and can be divided into three main categories: primary, complicated, and residual pulmonary coccidioidomycosis. The primary infection occurs with inhalation of airborne arthroconidia. As few as 10 arthroconidia are capable of causing an infection in animal models. Sixty percent of infected individuals will remain asymptomatic. This results in a positive skin test and, with rare exception, lifelong immunity. The other 40% will develop symptomatic disease that manifests with variable signs and symptoms, predominantly an influenza-like syndrome, pneumonia, or pleural effusion. The category of complicated pulmonary coccidioidomycosis includes clinical entities as severe and persistent pneumonia, progressive primary coccidioidomycosis, fibrocavitary coccidioidomycosis, cavities, and empyema, a complication of a ruptured cavity. Progression of primary pulmonary disease to acute respiratory distress syndrome (ARDS) can also qualify as a complication. The third category of residual disease comprises only two entities: pulmonary nodule and fibrosis. This review focuses on uncomplicated and complicated pulmonary coccidioidomycosis and its management as outlined earlier in addition to special considerations of coccidioidal fungemia, pulmonary coccidioidomycosis in pregnancy, and organ transplantation.