1887

Abstract

Two unknown, Gram-negative, catalase-negative and strictly anaerobic cocci were isolated from two independent human samples (strains AIP 49.01 and AIP 412.00). Comparative 16S rRNA gene sequencing demonstrated that these two organisms displayed 99·8 % sequence identity and that they are members of the sub-branch of the low-G+C Gram-positive bacteria. The most closely related 16S rDNA sequences were from sp. oral clone BU057 (99·8 %) and from isolates of and (94·5 and 93·8 %, respectively). Phylogenetic analysis based on 16S rDNA sequences showed that these two strains were most closely related to and belonged to the genus. Differences from previously described species in terms of size, biochemical tests (particularly the analysis of metabolic end products), gas production and DNA G+C content indicated that the two strains studied represent a novel species of anaerobic Gram-negative cocci. The name sp. nov. is proposed for these two isolates. It is also proposed that the uncultured organism previously deposited as sp. oral clone BU057 should be named ‘ Megasphaera micronuciformis’. The type strain of is AIP 412.00 (=CIP 107280 =CCUG 45952).

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2003-03-01
2024-04-20
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