Subjects will be enrolled to receive intravenously AmBisome® at 2 mg/kg/day for a maximum of 4 weeks. Treatment will be discontinued in case of failure, adverse events precluding treatment or success. In case of success AmBisome® at 2 mg/kg/day should be administered for at least 5 days after the complete resolution of all clinical findings of an active infection or for at least 8 days after the last positive blood culture or culture from a normally sterile site. It is not recommended to declare failure (and therefore change treatment) before giving at least 5 days of antifungal therapy. Failures in patients given less than 5 days of treatment should be well documented (e.g. persistent positive cultures despite catheter removal, clinical deterioration in absence of any explanation other than the fungal infection). Follow-up evaluations will be conducted at 2 and 4 weeks after the end of AmBisome® therapy. At end of treatment (time point for success or failure) patients may be shifted to oral (not intravenous) antifungals at the discretion of the local investigator, once a complete response has been achieved, if secondary prophylaxis is deemed necessary.