Severe fungal infections have become increasingly common over the past
10 years, largely due to the greater number of immunocompromised pati
ents, such as those infected with HIV and those undergoing immunosuppr
essive therapy for malignancies. Between 60% and 80% of people with AI
DS, for example, develop at least one fungal infection. Other predispo
sing factors for these infections include mechanical defects such as i
ndwelling catheters, surgery, and burns. Candidiasis, aspergillosis, c
ryptococcoses, coccidioidomycosis, and histoplasmosis are among the fu
ngal infections most commonly encountered in the clinical setting. Dia
gnosis is often elusive and treatment difficult. Amphotericin B has be
en the standard therapy for most life-threatening fungal infections fo
r almost three decades but has significant drawbacks, including severe
adverse reactions. Other systemic antifungal agents have proved usefu
l in certain situations. Fluconazole, a new broad-spectrum agent, has
shown particular promise in the treatment of candidiasis and cryptococ
cal meningitis.