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Phenotypic and Phylogenetic Characterization of a New Corynebacterium Species from Dogs: Description ofCorynebacterium auriscanis sp. nov

ABSTRACT Six strains of a previously undescribed catalase-positive coryneform bacterium isolated from clinical specimens from dogs were characterized by phenotypic and molecular genetic methods. Biochemical and chemotaxonomic studies revealed that the unknown bacterium belonged to the genus Corynebacterium sensu stricto. Comparative 16S rRNA gene sequencing showed that the six strains were genealogically highly related and constitute a new subline within the genusCorynebacterium; this subline is close to but distinct fromC. falsenii, C. jeikeium, and C. urealyticum. The unknown bacterium from dogs was distinguished from all currently validated Corynebacterium species by phenotypic tests including electrophoretic analysis of whole-cell proteins. On the basis of phylogenetic and phenotypic evidence, it is proposed that the unknown bacterium be classified as a new species,Corynebacterium auriscanis. The type strain of C. auriscanis is CCUG 39938T.