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Gram-negative bacterium was isolated from the blood of a patient with diabetes mellitus. However, it could not be identified by conventional microbiological methods, and so was characterized by phenotypic and genotypic analyses. 16S rRNA gene sequence analysis revealed that the strain belonged to the genus Neisseria. Based on the phenotypic and genotypic characteristics, we propose that strain SMC-A9199 T (5KCTC 22696 T 5JCM 16127 T) should be classified as a novel species, 'Neisseria skkuensis' sp. nov. The patient was further treated with amoxicillin-clavulanate and ciprofloxacin for 3 weeks. Bacterial isolate Strain SMC-A9199 T was Gram-negative, when stained at room temperature. It grew well aerobically on sheep blood agar and chocolate agar at 35 u C in an atmosphere of 5 % CO 2 after 24 h incubation. Colonies were round and light grey, and 3These authors contributed equally to this work. The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA, argF and recA gene sequences of 'N. skkuensis' strain SMC-A9199 T are FJ763637, FJ787491 and FJ787492, respectively.