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Swedish University of Agricultural Sciences

Veterinary bacteriology: information about important bacteria
Veterinary bacteriology


Species/Subspecies: Chlamydia trachomatis
Category: Primarily of interest in human medicin
Etymology: Genus name: a cloac.
Species epithet: of trachoma.
Significance:  [Very important]   
Taxonomy:
Phylum
Chlamydiota
Class
Chlamydiia
Order
Chlamydiales
Family
Chlamydiaceae 
Genus
Chlamydia
Type Strain: A/Har-13 (Trachoma type A strain HAR-13) = ATCC VR-571B.
Macromorphology (smell): Does only grow intracellularly and can, therfore, not be cultivated on artificial substrates.
Micromorphology: Outside the host cell: infectious elementary bodies (0.2-0.3 µm).
Within the host cell: non-infectious reticulate bodies (0.8-1.0 µm). C. trachomatis is non-motile.
Gram +/Gram -:G-, difficult to gram stain.
Metabolism: Aerobic, but members of the family Chlamydiaceae have only limited resources to to synthesize their own ATP. Therefore, they can ingest ATP from the host cell.
Catalase/Oxidase:
Spec. Char.:
Special Media:
Disease:Arthritis, conjunctivitis, pneumonia. genital infections (STD), trachoma
HostsDiseaseClinical picture
HumansChlamydios*Genital tract infection; Non-gonococcal urethritis, Salpingitis, Cervicitis, Epididymitis
*Ocular disease; Trachoma, Conjunctivitis (infants)
*Respiratory disease (infants)
*Proctitis
*Lymphogranuloma venerum
*Arthritis
Genome Sequence:
Acc-noStrainSize (bp)Genome
NC_007429 A/HAR-13T 1 044 459 1c + 1c 
Six strains have been sequenced and 0-1 plasmid has been found in these strains.

16S rRNA Seq.:
Acc-noStrainNumber of NTOperon
D89067 HAR-13T 1 548 

Taxonomy/phylogeny:
Chlamydia trachomatis  
Species within the family Chlamydiaceae were previously (1999) divided into two genera Chlamydia and Chlamydophila. However, the differences between these two genera were not that great and many research groups have not accepted this division. Therefore, the genus Chlamydophila has been returned (2015) to the genus Chlamydia. See the references below.
Comment:Strictly intracellular. The cell envelope contains cystein rich proteins and only a small amount of peptidoglycans.
Reference(s): No. 68, 140, 177
Links: The comprehensive reference and education wiki on Chlamydia and the Chlamydiales, Klamydia-föreläsning
Updated:2023-03-15

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