Name: Chlamydia trachomatis (Busacca 1935) Rake 1957 (Approved Lists 1980)

Category: Species

Proposed as: comb. nov.

Basonym: "Rickettsia trachomae" Busacca 1935

Etymology: Gr. neut. n. trachysma, a roughness; N.L. neut. n. trachoma, the disease trachoma; N.L. gen. neut. n. trachomatis, of trachoma

Gender: feminine

Type strain: A/Har-13; ATCC VR-571B; DSM 19440; Har-13; pC

See detailed strain information at

Conduct genome-based taxonomy at

16S rRNA gene: D89067 Analyse FASTA

Effective publication: Rake G. Family II. Chlamydiaceae Fam. Nov. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, seventh edition, The Williams & Wilkins Co, Baltimore, 1957, p. 957-968.

IJSEM list: Skerman VBD, McGowan V, Sneath PHA. Approved lists of bacterial names. Int J Syst Bacteriol 1980; 30:225-420.

Nomenclatural status: validly published under the ICNP

Taxonomic status: correct name

Risk group: 2

• Synonyms:

  • Name	Kind
    "Rickettsia trachomae" Busacca 1935	homotypic synonym, not validly published, basonym of name in Approved Lists

• Emendations:
  • Everett et al. 1999 Everett KD, Bush RM, Andersen AA. Emended description of the order Chlamydiales, proposal of Parachlamydiaceae fam. nov. and Simkaniaceae fam. nov., each containing one monotypic genus, revised taxonomy of the family Chlamydiaceae, including a new genus and five new species, and standards for the identification of organisms. Int J Syst Bacteriol 1999; 49:415-440. Anonymous. Notification list. Notification that new names and new combinations have appeared in volume 49, part 2 of the IJSB. Int J Syst Bacteriol 1999; 49:937-939.
  • García-López et al. 2019 Garcia-Lopez M, Meier-Kolthoff JP, Tindall BJ, Gronow S, Woyke T, Kyrpides NC, Hahnke RL, Goker M. Analysis of 1,000 Type-Strain Genomes Improves Taxonomic Classification of Bacteroidetes. Front Microbiol 2019; 10:2083. Oren A, Garrity GM. List of changes in taxonomic opinion no. 32. Notification of changes in taxonomic opinion previously published outside the IJSEM. Int J Syst Evol Microbiol 2020; 70:4061-4090.

• Notes:
  • Nomenclatural type of the genus Chlamydia Jones et al. 1945 (Approved Lists 1980). Publication: Jones H, Rake G, Stearns B. Studies on lymphogranuloma venereum. III. The action of the sulfonamides on the agent of lymphogranuloma venereum. Journal of Infectious Diseases 1945; 76:55-69.
  • According to Bartlett et al. (2022), this species is an established human pathogen. Publication: Bartlett A, Padfield D, Lear L, Bendall R, Vos M. A comprehensive list of bacterial pathogens infecting humans. Microbiology 2022; 168:0.
  • In the Approved Lists of Bacterial Names, the type strain is erroneously cited as ATCC VR 571B (without dash). — Tang J. Personal communication, 2001-05-30.

Parent taxon: Chlamydia Jones et al. 1945 (Approved Lists 1980)

Assigned by: Rake G. Family II. Chlamydiaceae Fam. Nov. In: Breed RS, Murray EGD, Smith NR (eds), Bergey's Manual of Determinative Bacteriology, seventh edition, The Williams & Wilkins Co, Baltimore, 1957, p. 957-968.

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Record number: 783629