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Listeria monocytogenes Infection of the Brain
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Listeria rocourtiae sp. nov.

Alexandre Leclercq1, Dominique Clermont2, Chantal Bizet2

  • 1Institut Pasteur, Groupe Microorganismes et barrières de l'hôte, WHO Collaborating Center for Foodborne Listeriosis and French National Reference Center for Listeria, Paris, France.

International Journal of Systematic and Evolutionary Microbiology
|November 17, 2009
PubMed
Summary

A novel Listeria species, Listeria rocourtiae, was identified in pre-cut lettuce. This avirulent bacterium can be distinguished from other Listeria species using phenotypic tests.

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Area of Science:

  • Microbiology
  • Food Safety
  • Bacteriology

Background:

  • The genus Listeria includes pathogenic species, necessitating accurate identification and characterization of novel isolates.
  • Foodborne pathogens pose significant public health risks, emphasizing the importance of microbial surveillance in food products.

Purpose of the Study:

  • To identify and characterize a Listeria-like strain isolated from pre-cut lettuce.
  • To determine if the isolate represents a novel species within the genus Listeria.
  • To propose a name and type strain for the newly identified species.

Main Methods:

  • Phylogenetic analysis based on the rrs gene (16S rRNA) sequence.
  • DNA-array hybridization for gene content comparison.
  • Phenotypic testing for differentiation from known Listeria species.
  • Virulence assessment using cell culture assays and mouse inoculation.

Main Results:

  • The isolate belonged to the genus Listeria but did not match any known species.
  • Phylogenetic and genomic analyses confirmed its status as a novel species.
  • Phenotypic tests allowed differentiation from all other Listeria species.
  • The type strain, CIP 109804(T), was found to be avirulent.

Conclusions:

  • A new species, Listeria rocourtiae sp. nov., is proposed for the isolate.
  • Listeria rocourtiae can be distinguished from other Listeria species by phenotypic characteristics.
  • The type strain of Listeria rocourtiae is avirulent, suggesting a potentially lower risk compared to pathogenic Listeria species.