Overview of systemic fungal infections

A steady increase in the frequency of invasive fungal infections has been observed in the past 2 decades, particularly in immunosuppressed patients. In recipients of bone marrow transplants, Candida albicans and Aspergillus fumigatus remain the primary pathogens. In many centers, however, Candida species other than C albicans now predominate, and many cases of aspergillosis are due to species other than A fumigatus. Additionally, heretofore unrecognized and/or uncommon fungal pathogens are beginning to emerge, including Blastoschizomyces capitatus, Fusarium species, Malassezia furfur, and Trichosporon beigelii. These opportunistic fungal pathogens are associated with various localized and disseminated clinical syndromes, and with substantial morbidity and mortality. These established, invasive mycoses, particularly in bone marrow transplant recipients, are the focus of this discussion.