Phenotypic and phylogenetic studies were performed on an unknown, Gram-positive, catalase-negative coccus isolated from human blood. Comparative 16S rRNA gene sequencing demonstrated that the organism represents a new subline within the genus Aerococcus. The unknown bacterium was readily distinguished from the three currently recognized Aerococcus species, Aerococcus christensenii, Aerococcus urinae and Aerococcus viridans, by biochemical tests and electrophoretic analysis of whole-cell proteins. On the basis of phylogenetic and phenotypic evidence, it is proposed that this unknown bacterium from blood be classified as Aerococcus sanguicola sp. nov. The type strain of Aerococcus sanguicola is CCUG 43001T (= CIP 106533T).


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