Though all four disease outcomes can impose a great health risk to humans; invasive aspergillosis tends to result in the highest mortality and morbidity rates in humans. Epidemiology studies have shown the incidence of "A. terreus" in causing invasive aspergillosis has increased relative to other species in the genus. "A. terreus" infection causes 100% mortality rate in people who acquire invasive aspergillosis. Compared to 20 other "Aspergillus" species, "A. terreus" infection is associated with the poorest prognosis and high mortality. In fact, invasive aspergillosis has been named as the leading cause of death in leukemia and stem cell transplantation patients.