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Gordonia otitidis sp. nov., isolated from a patient with external otitis

¹ Research Center for Pathogenic Fungi and Microbial Toxicoses, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8673, Japan
² Clinical Laboratory Chiba University Hospital, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8673, Japan
³ Department of Laboratory Medicine, Chiba University School of Medicine, Chiba University, 1-8-1, Inohana, Chuo-ku, Chiba 260-8673, Japan
⁴ Deutsche Sammlung von Mikroorganismen und Zellkulturen, Braunschweig, Germany

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

The taxonomic positions of two clinically isolated actinomycetes were established using a polyphasic approach. The two strains, IFM 10032^T, isolated from ear discharge of a 28-year-old Japanese female patient with external otitis, and IFM 10148, isolated from pleural fluid of a 60-year-old Japanese male patient with bronchitis, possessed meso-diaminopimelic acid as the diagnostic amino acid, MK-9(H₂) as the predominant menaquinone and mycolic acids ranging from 58 to 64 carbons. The 16S rRNA gene sequences of the two strains were most closely related to those of Gordonia aichiensis, Gordonia sputi and ‘Gordonia jacobaea’. Differences in several phenotypic characteristics together with genotypic distinctiveness distinguish strains IFM 10032^T and IFM 10148 from these three species. DNA–DNA hybridization results and the combination of genotypic and phenotypic data showed that the two strains belong to a single species, and merit recognition of a novel species within the genus Gordonia. The name proposed for this taxon is Gordonia otitidis sp. nov.; the type strain is IFM 10032^T (=DSM 44809^T=JCM 12355^T=NBRC 100426^T).

Published online ahead of print on 15 April 2005 as DOI 10.1099/ijs.0.63282-0.

The GenBank/EMBL/DDBJ accession numbers for the 16S rRNA gene sequences of IFM 10032^T and IFM 10148 are AB122026 and AB122027, respectively.

Detailed physiological properties of strains IFM 10032^T and IFM 10148 and representative Gordonia species are given in supplementary tables in IJSEM Online.

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