1887

Abstract

Six isolates of an unknown Gram-positive, catalase-negative, chain-forming, coccus-shaped organism isolated from ovine and caprine mastitis were characterized by phenotypic and molecular taxonomic methods. On the basis of cellular morphology and the results of biochemical tests, the organism was tentatively identified as a streptococcal species. Comparative 16S rRNA gene sequencing studies confirmed that the organism is a member of the genus , with as its closest phylogenetic relative (98·8 % similarity). DNA–DNA pairing studies showed that the unidentified organism displayed more than 70 % relatedness to the type strains of subsp. and subsp. . Despite the relatively high DNA–DNA reassociation values, biotyping and ribotyping allowed clear differentiation of the unknown bacterium from the two recognized subspecies of . On the basis of phenotypic and molecular genetic evidence, it is proposed that the unknown isolates from ovine and caprine mastitis be classified as a novel subspecies, subsp. subsp. nov. The type strain is CECT 5772 (=CCUG 47520=Mt 167).

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2004-11-01
2019-10-18
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vol. , part 6, pp. 2291–2296

A full version of the dendrogram shown in Fig. 1, including a wider sample of species, is available to download. [PDF](239KB)



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