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Nocardia exalbida sp. nov., isolated from Japanese patients with nocardiosis

¹ Research Center for Pathogenic Fungi and Microbial Toxicoses, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8673, Japan
² Division of Respiratory Medicine, St Luke's International Hospital, 9-1 Akashicho, Chuo-ku, 104-8560, Tokyo, Japan
³ Discovery Research Laboratories, Tanabe Seiyaku Co. Ltd, 2-2-50 Kawagishi, Toda, Saitama 335-8505, Japan
⁴ Department of Laboratory Medicine, Chiba University Hospital, School of Medicine, Chiba University, 1-8-1 Inohana, Chuo-ku, Chiba 260-8670, Japan
⁵ DSMZ – Deutsche Sammlung von Mikroorganismen und Zellkulturen, Braunschweig, Germany

Correspondence
Yuzuru Mikami
mikami{at}faculty.chiba-u.jp

Two bacterial strains isolated from different hospitals in Japan were subjected to a polyphasic analysis. Strains IFM 0803^T and IFM 10383 were found to have morphological, biochemical, physiological and chemotaxonomic properties consistent with their classification in the genus Nocardia. Strains IFM 0803^T and IFM 10383 clustered with the type strain of Nocardia xishanensis, showing 16S rRNA gene sequence similarities of 98.6–98.9 % with this species. The novel strains could be distinguished from N. xishanensis by a range of phenotypic properties. Based on their phenotypic and phylogenetic characteristics, the two isolates are proposed as members of a novel species of the genus Nocardia, Nocardia exalbida sp. nov., with the type strain IFM 0803^T (=NBRC 100660^T=JCM 12667^T=DSM 44883^T).

An extended phylogenetic tree based on 16S rRNA gene sequences, the TLC mycolic acid patterns of strain IFM 0803^T and a comparison of the physiological properties of 53 recognized Nocardia species are available as supplementary material in IJSEM Online.

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