Name: Lawsonia intracellularis McOrist et al. 1995

Category: Species

Proposed as: sp. nov.

Etymology: in.tra.cel.lu.la’ris. N.L. fem. n. Lawsonia, in honor of G. H. K. Lawson, the discoverer of the bacterium; L. adv. intra, within; L. fem. n. cellula, cell; N.L. fem. adj. intracellularis, within small cells, referring to the presence of the organism within enterocytes

Pronunciation (Latin), gender: law-SO-ni-a in-tra-kel-lu-LA-ris, feminine

Type strain: 1482/89; NCTC 12656

16S rRNA gene: L15739 Analyse FASTA

Valid publication: McOrist S, Gebhart CJ, Boid R, Barns SM. Characterization of Lawsonia intracellularis gen. nov., sp. nov., the obligately intracellular bacterium of porcine proliferative enteropathy. Int J Syst Bacteriol 1995; 45:820-825. 🇺🇸

IJSEM list: Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 45, part 4 of the IJSB. Int J Syst Bacteriol 1996; 46:364-365.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name (and explicitly recommended for medical use)

Risk group: 2

• Synonyms:

  • Name	Kind
    "Candidatus Lawsonia intracellularis" corrig. Gebhart et al. 1993	homotypic synonym, pro-validly published under the ICNP
    "Candidatus intracellularis" Gebhart et al. 1993	homotypic synonym, inaccurate spelling

• Notes:
  • 🥇 Nomenclatural type of the genus Lawsonia McOrist et al. 1995. Publication: McOrist S, Gebhart CJ, Boid R, Barns SM. Characterization of Lawsonia intracellularis gen. nov., sp. nov., the obligately intracellular bacterium of porcine proliferative enteropathy. Int J Syst Bacteriol 1995; 45:820-825. 🇺🇸
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 1, note = "animal pathogen - biological class of risk animal: 2". — The risk group for Canada has been imported on 2024-02-27. The full classification is: risk group = 1, note = "Animal classification RG: 2 - Security sensitive biological agent: No - Terrestrial animal pathogen under Canadian Food Inspection Agency authority: No - Containment level: Containment Level 2". — The risk group for Swiss Confederation has been imported on 2024-02-01. The full classification is: risk group = 2, note = "PV". — The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 2, note = "t". — If in doubt, use the risk group given in the regulations for your country and, if these are not available, use the risk group given in the catalogue of the culture collection from which you have obtained or intend to obtain the strain.
  • 🎓 Name mentioned 471 times in PubMed until 2026-06-11.
  • 🙆 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as the name to be applied to this species. The name is on LoRN because of the recorded risk group of the species itself.
  • 🧍 Lawsonia intracellularis was previously known as "Ileal symbiont intracellularis" Gebhart et al. 1993, or as "Candidatus intracellularis" Murray and Stackebrandt 1995. Publication: Murray RG, Stackebrandt E. Taxonomic note: implementation of the provisional status Candidatus for incompletely described procaryotes. Int J Syst Bacteriol 1995; 45:186-187. 🇩🇪

Parent taxon: Lawsonia McOrist et al. 1995

Assigned by: McOrist S, Gebhart CJ, Boid R, Barns SM. Characterization of Lawsonia intracellularis gen. nov., sp. nov., the obligately intracellular bacterium of porcine proliferative enteropathy. Int J Syst Bacteriol 1995; 45:820-825. 🇺🇸

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Record number: 784078