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Gram-positive, non-spore-forming rods (strain 4401292T) were isolated from a human blood sample. Based on cellular morphology and the results of biochemical tests, this strain was tentatively identified as belonging to an undescribed species of the genus Actinomyces. Phylogenetic analysis based on 16S rRNA gene sequence comparison showed that the bacterium was related closely to Actinomyces gerencseriae (95.1 % 16S rRNA gene sequence similarity), Actinomyces israelii (95.2 %), Actinomyces oricola (95.2 %), Actinomyces ruminicola (93.3 %) and Actinomyces dentalis (91.4 %). The predominant fatty acids were C18 : 1ω9c and C16 : 0. On the basis of phenotypic data and phylogenetic inference, the novel species Actinomyces massiliensis sp. nov. is proposed; the type strain is 4401292T (=CSUR P18T=CCUG 53522T).
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