We describe a case of central venous catheter-related fungemia caused by Cryptococcus liquefaciens, a non-neoformans and non-gattii Cryptococcus, in a non-HIV patient. A 71-year-old man with diffuse large B-cell lymphoma receiving antineoplastic chemotherapy was febrile approximately 30 weeks after central venous port insertion, and C. liquefaciens was isolated from all three performed blood cultures as well as a central venous catheter tip culture. In vitro antifungal susceptibility tests showed that this yeast isolate was susceptible to low concentrations of amphotericin B, fluconazole, itraconazole and voriconazole yet was resistant to 5-fluorocytosine (MIC: >64 μg/ml), unlike Cryptococcus neoformans. Treatment of the patient with oral and intravenous voriconazole was effective and consistent with the susceptibility tests. Although non-neoformans and non-gattii Cryptococcus spp. are considered non-pathogenic environmental yeast, they may rarely be the causative agents of serious infections in humans, as in the present case.
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