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Updated: Jun 25, 2026

Identification of Rare Bacterial Pathogens by 16S rRNA Gene Sequencing and MALDI-TOF MS
Published on: July 11, 2016
Actinomyces massiliensis sp. nov., isolated from a patient blood culture
Aurélie Renvoise1, Didier Raoult, Véronique Roux
1Laboratoire de Bactériologie-Virologie, Hôpital de la Timone, CNRS UMR 6236, CNRS-IRD, IFR48, 264 rue Saint-Pierre, 13385 Marseille Cedex 05, France.
Abstract:
Gram-positive, non-spore-forming rods (strain 4401292(T)) 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 : 1omega9c 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 4401292(T) (=CSUR P18(T)=CCUG 53522(T)).
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