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Ochrobactrum pseudintermedium sp. nov., a novel member of the family Brucellaceae, isolated from human clinical samples

¹ Université Montpellier 1, Laboratoire de Bactériologie-Virologie, EA3755, Faculté de Pharmacie, 15 Avenue Charles Flahault, BP 14491, F-34093 Montpellier Cedex 5, France
² CHU de Montpellier, Laboratoire de Bactériologie, Hôpital Arnaud de Villeneuve, 371 Avenue du doyen Gaston Giraud, -34295 Montpellier Cedex 5, France

Correspondence
Corinne Teyssier
corinne.teyssier{at}univ-montp1.fr

Three novel Gram-negative, non-fermenting aerobic bacilli were isolated from human clinical samples. They shared more than 99.8 % of the 16S rRNA gene nucleotide positions. The strains were related to Ochrobactrum intermedium with about 97.48 % 16S rRNA gene sequence similarity. In 16S rRNA gene-, dnaK- and rpoB-based phylogenies, the strains were grouped in a lineage that was distinct from other Ochrobactrum species in the family Brucellaceae. Fatty acid composition, polar lipids, quinone system, DNA–DNA relatedness, genome organization, and physiological and biochemical data differentiated these isolates from recognized species of the genus Ochrobactrum. The three clinical strains therefore represent a novel species within the genus Ochrobactrum, for which the name Ochrobactrum pseudintermedium sp. nov., is proposed. The type strain is ADV31^T (=CIP 109116^T=DSM 17490^T). The DNA G+C content of strain ADV31^T was 54.5 mol%.

A phylogenetic tree based on concatenated dnaK and rpoB gene sequences of strains ADV31^T, AD41 and AD43 and other members of the genera Ochrobactrum and Brucella, a schematic representation of the rrn skeleton of the two chromosomes of strain ADV31^T and a two-dimensional thin-layer chromatogram of the polar lipids of strain ADV31^T are available as supplementary figures in IJSEM Online.

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