Name: Haemophilus equigenitalis Taylor et al. 1983

Category: Species

Proposed as: sp. nov.

Etymology: e.qui.ge.ni.ta’lis. L. masc. n. equus, horse; L. adj. genitalis -is -e, of or belonging to generation or birth, genital; N.L. masc. adj. equigenitalis, pertaining to horse genitalia

Pronunciation (Latin), gender: … e-kwi-ge-ni-TA-lis, masculine

Type strain: ATCC 35865; CCUG 10786; CIP 79.07; DSM 10668; LMG 6222; NCTC 11184; Strain 61717/77

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: AF408197 Analyse FASTA

Effective publication: Taylor CE, Rosenthal RO, Brown DF, Lapage SP, Hill LR, Legros RM. The causative organism of contagious equine metritis 1977: proposal for a new species to be known as Haemophilus equigenitalis. Equine Vet J 1978; 10:136-144.

IJSEM list: Anonymous. Validation list no. 10. Validation of publication of new names and new combinations previously effectively published outside the IJSB. Int J Syst Bacteriol 1983; 33:438-440.

Nomenclatural status: validly published under the ICNP

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

Correct name: Taylorella equigenitalis (Taylor et al. 1983) Sugimoto et al. 1984

Risk group: 2

• Synonyms:

  • Name	Kind
    Taylorella equigenitalis (Taylor et al. 1983) Sugimoto et al. 1984	homotypic synonym, validly published under the ICNP

• Notes:
  • ❗ Haemophilus equigenitalis 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 Haemophilus.
  • 😷 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 2023-10-29. 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 35 times in PubMed until 2025-06-04.
  • 🙅 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: Haemophilus corrig. Winslow et al. 1917 (Approved Lists 1980)

Assigned by: Taylor CE, Rosenthal RO, Brown DF, Lapage SP, Hill LR, Legros RM. The causative organism of contagious equine metritis 1977: proposal for a new species to be known as Haemophilus equigenitalis. Equine Vet J 1978; 10:136-144.

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Record number: 776644