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Streptococcus ovis sp. nov., isolated from sheep.

M D Collins, R A Hutson, L Hoyles

    International Journal of Systematic and Evolutionary Microbiology
    |June 20, 2001
    PubMed
    Summary

    Researchers identified a novel bacterium from sheep, Streptococcus ovis sp. nov. This Gram-positive coccus is distinct from other Streptococcus species, based on genetic and biochemical analyses.

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    Area of Science:

    • Microbiology
    • Bacteriology
    • Taxonomy

    Background:

    • Clinical specimens from sheep yielded seven strains of an unidentified Gram-positive, catalase-negative, chain-forming coccus.
    • Initial observations suggested a unique bacterial profile requiring detailed characterization.

    Purpose of the Study:

    • To identify and classify a novel bacterial species isolated from sheep.
    • To differentiate the unknown organism from known species within the Streptococcus genus.

    Main Methods:

    • Phenotypic characterization including biochemical tests and electrophoretic analysis of whole-cell proteins.
    • Molecular taxonomic methods, specifically comparative 16S rRNA gene sequencing.

    Main Results:

    • Phylogenetic analysis based on 16S rRNA gene sequences revealed a new sub-line within the Streptococcus genus.

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  • Biochemical and protein analyses confirmed the distinctness of the unknown strains from established Streptococcus species.
  • The seven isolates were consistently identified as a single, novel species.

    • Conclusions:

    • The characterized organism represents a new species, Streptococcus ovis sp. nov.
    • Phylogenetic and phenotypic data support the classification of Streptococcus ovis.
    • The type strain for this new species is designated CCUG 39485T (= LMG 19174T).