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Streptococcus entericus sp. nov., isolated from cattle intestine.

A I Vela1, E Fernández, P A Lawson

  • 1Departamento de Patología Animal I (Sanidad Animal), Facultad de Veterinaria, Universidad Complutense, Madrid, Spain.

International Journal of Systematic and Evolutionary Microbiology
|April 5, 2002
PubMed
Summary

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A novel bacterium, Streptococcus entericus sp. nov., was identified from a cow with enteritis. This catalase-negative coccus represents a new species within the Streptococcus genus.

Area of Science:

  • Microbiology
  • Bacteriology
  • Genomics

Background:

  • An unknown Gram-positive, catalase-negative coccus was isolated from a cow with catarrhal enteritis.
  • Initial tests suggested a streptococcal species, prompting further investigation.

Purpose of the Study:

  • To identify and classify a novel bacterial species isolated from bovine intestinal tract.
  • To differentiate the isolate from known Streptococcus species using phenotypic and phylogenetic methods.

Main Methods:

  • Biochemical and molecular genetic analyses, including 16S rRNA gene sequencing.
  • Cellular morphology, biochemical profiling, and electrophoretic analysis of whole-cell proteins.
  • Phylogenetic analysis to determine evolutionary relationships.

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Main Results:

  • 16S rRNA gene sequencing confirmed the isolate as a member of the genus Streptococcus.
  • The bacterium did not match any recognized Streptococcus species, with Streptococcus acidominimus and Streptococcus suis as nearest relatives.
  • Biochemical tests and protein electrophoresis distinguished the isolate from other animal streptococci.

Conclusions:

  • The phenotypic and phylogenetic data support the classification of the unknown bacterium as a new species.
  • The novel species is proposed as Streptococcus entericus sp. nov., with strain CECT 5353T as the type strain.