Description of Olsenella absiana sp. nov., an anaerobic bacterium isolated from pig faeces

A short-rod-shaped, obligate anaerobic, Gram-positive bacterium isolated from the faeces of a pig was designated as the strain YH-ols2223^T. Analysis of the 16S rRNA gene sequence revealed that the isolate was most closely related to <i>Olsenella urininfantis</i> KCTC 25755^T with 97.7% similarity. The multi-locus sequence tree revealed that the isolate formed a sub-cluster within the genus <i>Olsenella</i>. The average nucleotide identity and the digital DNA-DNA hybridization values for the isolate and the most closely related strains were 74.9-76.6% and 20.8-22.5%, respectively. The end products of the fermentation were lactic acid and acetic acid. The main fatty acids identified were C_{18 : 0} DMA, C_{18 : 1} <i> ω</i>9<i>c</i> DMA and C_{18 : 1} <i> ω</i>9<i>c</i>. The cell wall contained the <i>meso</i>-diaminopimelic acid-based peptidoglycan. Given the chemotaxonomic, phenotypic and phylogenetic properties, YH-ols2223^T (= KCTC 25800^T = NBRC 116680^T) represents a novel taxon. The name <i>Olsenella absiana</i> sp. nov. was proposed.