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Enterococcus caccae sp. nov., isolated from human stools.

Maria da Glória S Carvalho1, P Lynn Shewmaker1, Arnold G Steigerwalt1

  • 1Division of Bacterial and Mycotic Diseases, National Center for Infectious Diseases, Centers for Disease Control and Prevention, 1600 Clifton Rd NE, Mail Stop C-02, Atlanta, GA 30333, USA.

International Journal of Systematic and Evolutionary Microbiology
|July 11, 2006
PubMed
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Two novel enterococcus-like strains were identified from human stool samples. These isolates represent a new species, Enterococcus caccae sp. nov., distinct from known enterococci.

Area of Science:

  • Microbiology
  • Bacteriology
  • Taxonomy

Background:

  • Two enterococcus-like strains were isolated from human stool samples.
  • These isolates were referred to the Centers for Disease Control and Prevention (CDC) Streptococcus Laboratory for identification.

Purpose of the Study:

  • To identify and characterize two novel enterococcus-like strains.
  • To determine if these strains represent a new species within the Enterococcus genus.

Main Methods:

  • Conventional physiological tests
  • Whole-cell-protein electrophoresis
  • AccuProbe Enterococcus genetic probe and Lancefield extracts
  • 16S rRNA gene sequencing
  • DNA-DNA relatedness experiments

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Main Results:

  • The isolates were distinct from known enterococcal species based on physiological tests.
  • Protein profiles were unique but similar to Enterococcus moraviensis and Enterococcus haemoperoxidus.
  • 16S rRNA gene sequencing showed 99.6% identity to E. moraviensis.
  • DNA-DNA relatedness was below 32% to recognized Enterococcus species, confirming a novel taxon.

Conclusions:

  • The two stool isolates constitute a novel species, Enterococcus caccae sp. nov.
  • The type strain is 2215-02(T).