For patients who remain febrile after 14 days but who are otherwise stable and have no discernable cause for the fever, continuation of treatment with AmBisome 3 mg/kg/day or treatment with another antifungal drug treatment, antibiotic, or discontinuation of antimicrobial therapy will be undertaken at the discretion of the investigator. Patients who meet these criteria will have a thorough diagnostic evaluation to investigate the cause of their fever.