Listeria grayi explained

Listeria grayi is a species of bacteria. It is a Gram-positive, facultatively anaerobic, motile, non-spore-forming bacillus. It is non-hemolytic. The species was first proposed in 1966. It is named after M.L. Gray, an early researcher in L. monocytogenes[1] There are two subspecies of L. grayi: L. gray subs. grayi, and L. grayi subsp. murrayi.[2]

Listeria murrayi (named after a co-founder of L. monocytogenes) was originally a separate species of Listeria when proposed in 1971.[3] However, there was controversy over whether L. grayi and L. murrayi were the same species, or belonged in genus Listeria altogether. In 1974, researchers suggested that a new genus be created for the two species, called, Murraya,[4] although furthers studies by other researchers in 1987 proposed that the two species remain in Listeria.[5] In 1996, further studies showed that L. murrayi was a subspecies of L. grayi.[1]

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Notes and References

  1. 1736964. 1992. Rocourt. J.. Assignment of Listeria grayi and Listeria murrayi to a single species, Listeria grayi, with a revised description of Listeria grayi. International Journal of Systematic Bacteriology. 42. 1. 171–4. Boerlin. P.. Grimont. F.. Jacquet. C.. Piffaretti. J. C.. 10.1099/00207713-42-1-171. free.
  2. 8782674. 1996. Sallen. B.. Comparative analysis of 16S and 23S rRNA sequences of Listeria species. International Journal of Systematic Bacteriology. 46. 3. 669–74. Rajoharison. A.. Desvarenne. S.. Quinn. F.. Mabilat. C.. 10.1099/00207713-46-3-669. free.
  3. 10.1099/00207713-21-1-3. Listeria murrayi. Sp. N.: A Nitrate-Reducing Mannitol-Fermenting Listeria. International Journal of Systematic Bacteriology. 21. 3–7. 1971. Welshimer. H. J.. Meredith. A. L.. free.
  4. 10.1099/00207713-24-2-177. Taxonomic Reexamination of Listeria Pirie and Transfer of Listeria grayi and Listeria murrayi to a New Genus, Murraya. International Journal of Systematic Bacteriology. 24. 2. 177–185. 1974. Stuart. S. E.. Welshimer. H. J.. free.
  5. 10.1099/00207713-37-3-298. Proposal to Retain Listeria murrayi and Listeria grayi in the Genus Listeria. International Journal of Systematic Bacteriology. 37. 3. 298–300. 1987. Rocourt. J.. Wehmeyer. U.. Cossart. P.. Stackebrandt. E.. free.

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