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Streptococcus merionis sp. nov., isolated from Mongolian jirds (Meriones unguiculatus)

Dennis Tappe1, Rüdiger Pukall, Peter Schumann

  • 1Institute of Hygiene and Microbiology, University of Würzburg, Josef-Schneider-Strasse 2, D-97080 Würzburg, Germany.

International Journal of Systematic and Evolutionary Microbiology
|March 31, 2009
PubMed

Insights

Researchers discovered a new Streptococcus species, Streptococcus merionis, in Mongolian jirds and the Echinococcus multilocularis tapeworm. This finding expands our understanding of bacterial diversity in these hosts.

Area of Science:

  • Microbiology
  • Veterinary Parasitology
  • Genomics

Background:

  • The fox tapeworm Echinococcus multilocularis is a significant parasite.
  • The microbiome of intermediate hosts like Mongolian jirds (Meriones unguiculatus) is not fully understood.
  • Streptococcus species are common bacteria with diverse roles.

Purpose of the Study:

  • To identify and characterize novel bacterial species isolated from Echinococcus multilocularis and Mongolian jirds.
  • To determine the phylogenetic relationship of these isolates within the genus Streptococcus.

Main Methods:

  • Isolation and phenotypic characterization of bacterial strains.
  • Gram staining, catalase test, hemolytic activity assay, and pyrrolidonyl arylamidase test.
  • 16S rRNA gene sequencing for phylogenetic analysis.

Main Results:

  • Gram-positive, catalase-negative cocci were isolated from tapeworm vesicles and jird oropharynges.
  • The isolates showed weak reactions with Lancefield group D antiserum and lacked hemolytic activity.
  • 16S rRNA gene sequencing identified the isolates as a novel species within the genus Streptococcus, closely related to Streptococcus hyointestinalis.

Conclusions:

  • The isolated bacteria represent a novel species, Streptococcus merionis sp. nov.
  • This discovery highlights potential bacterial associations with Echinococcus multilocularis and its hosts.
  • Further research is needed to understand the ecological role of Streptococcus merionis.

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