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Anaerostipes butyraticus sp. nov., an anaerobic, butyrate-producing bacterium from Clostridium cluster XIVa, isolated from broiler chicken caecal content

¹ Faculty of Veterinary Medicine, Ghent University, Belgium;
² Laboratory of Microbiology, Ghent University, Belgium

³ E-mail: venessa.eeckhaut{at}ugent.be

Four butyrate-producing isolates were obtained from the caecal content of a four week old broiler chicken. The 16S rRNA gene sequences were determined and confirmed the close relatedness of the four isolates suggesting that they were derived from a single bacterial clone. Phylogenetic analysis based on comparative 16S rRNA gene sequencing showed that its closest relatives were members of cluster XIVa of the Clostridium subphylum of Gram-positive bacteria and that the closest related type strain was Anaerostipes caccae DSM 14662T (94.5 % similarity). Similarity levels of 96-98 % towards many sequences from uncultured bacteria from human stool samples were observed. On the basis of morphological, biochemical and phylogenetic characteristics, this strain is assigned to a novel species in the genus Anaerostipes, for which the name Anaerostipes butyraticus sp. nov. is proposed. The type strain is strain 35-7T (=LMG 24724T =DSM 22094T).