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The taxonomic position of a strain isolated from kerosene-contaminated soil in Hungary and formerly misidentified as Brevundimonas vesicularis was examined using a polyphasic approach. The isolate, designated CHB-20pT, could be clearly assigned to the genus Chryseobacterium (family Flavobacteriaceae) on the basis of 16S rRNA gene sequence similarity. Strain CHB-20pT, a moderate oil degrader, was a Gram-negative, aerobic, mesophilic microbe with a temperature optimum of 28–30 °C. Predominant fatty acids were iso-C15 : 0, summed feature 3 (comprising C16 : 1 ω7c and/or iso-C15 : 0 2-OH) and iso-C17 : 0 3-OH. Menaquinone-6 (MK-6) was the predominant respiratory quinone; MK-5 was present as a minor component. The almost complete 16S rRNA gene sequence of strain CHB-20pT shared 94–97 % similarity with sequences of the type strains of species of the genus Chryseobacterium. DNA–DNA relatedness between strain CHB-20pT and its closest relative, Chryseobacterium caeni, was lower than 46 %. Moreover, several diagnostic phenotypic properties distinguished strain CHB-20pT from C. caeni. On the basis of biochemical, chemotaxonomic and genotypic data, isolate CHB-20pT represents a novel species within the genus Chryseobacterium, Chryseobacterium hungaricum sp. nov.; the type strain is CHB-20pT (=NCAIM B2269T=DSM 19684T).
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