Species Prescottella equi

Name: Prescottella equi (Magnusson 1923) Sangal et al. 2022

Category, proposed as: species, comb. nov.

Basonym: Corynebacterium equi Magnusson 1923 (Approved Lists 1980)

Etymology: e’qui. L. gen. masc. n. equi, of the horse

Pronunciation (Latin), gender: pres-kot-TEL-la E-kwi, feminine

Type strain: 25729; ATCC 25729; ATCC 6939; C 7; CCUG 892; CECT 555; CIP 54.72; DSM 20307; HAMBI 2061; IFO 14956; JCM 1311; JCM 3209; LMG 18452; NBIMCC 1230; NBRC 101255; NBRC 14956; NCTC 1621; NRRL B-16538; VKM Ac-953

Conduct genome-based taxonomy at

16S rRNA gene: AF490539 Analyse FASTA

Valid publication: Sangal V, Goodfellow M, Jones AL, Sutcliffe IC. A stable home for an equine pathogen: valid publication of the binomial Prescottella equi gen. nov., comb. nov., and reclassification of four rhodococcal species into the genus Prescottella. Int J Syst Evol Microbiol 2022; 72:5551. 🇬🇧

IJSEM list: Oren A, Göker M. Notification list. Notification that new names and new combinations have appeared in volume 72, part 9 of the IJSEM. Int J Syst Evol Microbiol 2022; 72:5681.

Nomenclatural status: validly published under the ICNP

Taxonomic status: synonym (and not recommended for medical use)

Correct name: Rhodococcus equi (Magnusson 1923) Goodfellow and Alderson 1977 (Approved Lists 1980)

Risk group: 2

• Synonyms:

  • Name	Kind
    "Prescottella equi" (Magnusson 1923) Jones et al. 2013	homotypic synonym, not validly published
    "Proactinomyces restrictus" Turfitt 1944	heterotypic synonym, not validly published, basonym of name in Approved Lists
    "Prescottia equi" (Magnusson 1923) Jones et al. 2013	homotypic synonym, not validly published
    Nocardia restricta (Turfitt 1944) McClung 1974 (Approved Lists 1980)	heterotypic synonym, validly published under the ICNP
    Rhodococcus equi (Magnusson 1923) Goodfellow and Alderson 1977 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP
    Corynebacterium equi Magnusson 1923 (Approved Lists 1980)	homotypic synonym, validly published under the ICNP

• Notes:
  • 🥇 Nomenclatural type of the genus Prescottella Sangal et al. 2022. Publication: Sangal V, Goodfellow M, Jones AL, Sutcliffe IC. A stable home for an equine pathogen: valid publication of the binomial Prescottella equi gen. nov., comb. nov., and reclassification of four rhodococcal species into the genus Prescottella. Int J Syst Evol Microbiol 2022; 72:5551. 🇬🇧
  • ⏲ According to Kämpfer et al. (2014), this species is a later heterotypic synonym of "Bacillus hoagii" Morse 1912 but this is in conflict with the rules of the International Code of Nomenclature of Prokaryotes. Publication: Kampfer P, Dott W, Martin K, Glaeser SP. Rhodococcus defluvii sp. nov., isolated from wastewater of a bioreactor and formal proposal to reclassify [Corynebacterium hoagii] and Rhodococcus equi as Rhodococcus hoagii comb. nov. Int J Syst Evol Microbiol 2014; 64:755-761. 🇩🇪
  • ⏲ According to Kämpfer et al. (2014), this species is a later heterotypic synonym of Corynebacterium hoagii (Morse 1912) Eberson 1918 (Approved Lists 1980) but this is in conflict with the rules of the International Code of Nomenclature of Prokaryotes. Publication: Kampfer P, Dott W, Martin K, Glaeser SP. Rhodococcus defluvii sp. nov., isolated from wastewater of a bioreactor and formal proposal to reclassify [Corynebacterium hoagii] and Rhodococcus equi as Rhodococcus hoagii comb. nov. Int J Syst Evol Microbiol 2014; 64:755-761. 🇩🇪
  • ⏲ According to Kämpfer et al. (2014), this species is a later heterotypic synonym of Rhodococcus hoagii (Morse 1912) Kämpfer et al. 2014 but this is in conflict with the rules of the International Code of Nomenclature of Prokaryotes. Publication: Kampfer P, Dott W, Martin K, Glaeser SP. Rhodococcus defluvii sp. nov., isolated from wastewater of a bioreactor and formal proposal to reclassify [Corynebacterium hoagii] and Rhodococcus equi as Rhodococcus hoagii comb. nov. Int J Syst Evol Microbiol 2014; 64:755-761. 🇩🇪
  • ⏲ According to Nouioui et al. (2018), this species is a later heterotypic synonym of "Bacillus hoagii" Morse 1912 but this is in conflict with the rules of the International Code of Nomenclature of Prokaryotes. Publication: Nouioui I, Carro L, Garcia-Lopez M, Meier-Kolthoff JP, Woyke T, Kyrpides NC, Pukall R, Klenk HP, Goodfellow M, Goker M. Genome-Based Taxonomic Classification of the Phylum Actinobacteria. Front Microbiol 2018; 9:2007. 🇩🇪
  • ⏲ According to Nouioui et al. (2018), this species is a later heterotypic synonym of Corynebacterium hoagii (Morse 1912) Eberson 1918 (Approved Lists 1980) but this is in conflict with the rules of the International Code of Nomenclature of Prokaryotes. Publication: Nouioui I, Carro L, Garcia-Lopez M, Meier-Kolthoff JP, Woyke T, Kyrpides NC, Pukall R, Klenk HP, Goodfellow M, Goker M. Genome-Based Taxonomic Classification of the Phylum Actinobacteria. Front Microbiol 2018; 9:2007. 🇩🇪
  • ⏲ According to Nouioui et al. (2018), this species is a later heterotypic synonym of Rhodococcus hoagii (Morse 1912) Kämpfer et al. 2014 but this is in conflict with the rules of the International Code of Nomenclature of Prokaryotes. Publication: Nouioui I, Carro L, Garcia-Lopez M, Meier-Kolthoff JP, Woyke T, Kyrpides NC, Pukall R, Klenk HP, Goodfellow M, Goker M. Genome-Based Taxonomic Classification of the Phylum Actinobacteria. Front Microbiol 2018; 9:2007. 🇩🇪
  • ⏰ According to Rainey et al. (1995), this species is an earlier heterotypic synonym of "Proactinomyces restrictus" Turfitt 1944. Publication: Rainey FA, Burghardt J, Kroppenstedt R, Klatte S, Stackebrandt E. Polyphasic evidence for the transfer of Rhodococcus roseus to Rhodococcus rhodochrous. Int. J. Syst. Bacteriol. 1995; 45:101-103. 🇩🇪
  • ⏰ According to Rainey et al. (1995), this species is an earlier heterotypic synonym of Nocardia restricta (Turfitt 1944) McClung 1974 (Approved Lists 1980). Publication: Rainey FA, Burghardt J, Kroppenstedt R, Klatte S, Stackebrandt E. Polyphasic evidence for the transfer of Rhodococcus roseus to Rhodococcus rhodochrous. Int. J. Syst. Bacteriol. 1995; 45:101-103. 🇩🇪
  • 🏢 Synonymy of this taxon was mentioned in an IJSEM list. Publication: Oren A, Garrity GM. List of changes in taxonomic opinion no. 29. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2019; 69:13-32.
  • ❗ Prescottella equi is the correct name instead if this species is regarded as a separate species (i.e., if its nomenclatural type is not assigned to another species whose name is validly published, legitimate and not rejected and has priority) within a separate genus Prescottella.
  • 😷 The risk group for Belgium has been imported on 2024-02-05. The full classification is: risk group = 2, note = "human and animal pathogen - biological class of risk animal: 2". — The risk group for Germany has been imported on 2026-08-13. The full classification is: risk group = 2, note = "ht". — 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 18 times in PubMed until 2026-06-11.
  • 🙅 This name is on the List of Recommended Names for bacteria of medical importance (LoRN) as a synonym of the name to be applied to this species. The name is on LoRN because of the recorded risk group of the species itself.

Parent taxon: Prescottella Sangal et al. 2022

Assigned by: Sangal V, Goodfellow M, Jones AL, Sutcliffe IC. A stable home for an equine pathogen: valid publication of the binomial Prescottella equi gen. nov., comb. nov., and reclassification of four rhodococcal species into the genus Prescottella. Int J Syst Evol Microbiol 2022; 72:5551. 🇬🇧

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Record number: 30170