Peritonitis in a neonate due to Cyberlindnera fabianii, an ascomycetic yeast.

The ascomycetous yeast Cyberlindera fabianii is not only present in the environment, but is also occasionally pathogenic. Especially, neonates seem to be prone to infection. Here, we describe a case of peritoneal infection of a neonate after congenital heart surgery. The correct identification of this peculiar species is made by MALDI-TOF and especially by molecular biology methods, whereas the standard biochemical identification methods fail.The neonate with a hypoplastic left heart syndrome had a Norwood palliation followed by transient ECMO therapy for 3 days. The patient developed a renal insufficiency, so that peritoneal dialysis was initiated. After a few days, a peritoneal infection due to C. fabianii emerged. The proper source of this rare and particular yeast remains obscure. In spite of a reasonable antimycotic therapy, the patient developed a capillary leak syndrome and died finally in septic shock with multiorgan failure. One reason is probably that the yeast population, which was highly susceptible to all common antimycotic drugs at the beginning of therapy with fluconazole (and for a short period with caspofungin and liposomal amphotericin B), became rapidly resistant.