Abstract: Objective To report a case of toxic epidermal necrolysis associated with geotrichosis due to Geotrichum silvicola.Methods The exudates from the body surface,blood and urine of the patient were examined by microscopy and simultaneously inoculated onto the Sabouraud dextrose agar (SDA) medium.The isolate was examined by microscopy,PCR which amplified the D1/D2 domain of 26S rDNA,and gene sequencing.Homologous sequences were searched in the GenBank/EMBL/DDBJ/PD nucleotide sequence library,and the genetic relationship was analyzed with the genealogical tree.Results Microscopy of pus from the abscess on the dorsa of left hand revealed a lot of spores and a few hyphae,which were not observed in the blood or urine specimens.Meanwhile,whitish colonies were grown in all the three successive cultures of blood and urine specimens,rather than the exudates on the body surface.After itraconazole and garlicin were administered for one week,both microscopic exam and fungus culture were negative.Microscopic exam of the isolate showed arthrospores arranged in chains,budding spores and a few of hyphae.It was found that there was a one-base difference between our isolate (Hebei-1) and the isolate from kerion-like eruptions (Changzheng-1),and a four-base difference between our isolate and the reference Geotrichum silvicola strain as well,in the D1/D2 domain of 26S rDNA.This isolate was identified to be most close to Changzheng-1 in the phylogenetic tree.Conclusion The patient with toxic epidermal necrolysis is associated with geotrichosis due to Geotrichum silvicola.

Key words: Epidermal necrolysis, toxic, Geotrichosis, Geotrichum silvicola