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Revision as of 16:51, 5 February 2016

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Chlamydia trachomatis
C. trachomatis inclusion bodies (brown) in a McCoy cell culture.
C. trachomatis inclusion bodies (brown) in a McCoy cell culture.
Scientific classification
Kingdom: Bacteria
Phylum: Chlamydiae
Order: Chlamydiales
Family: Chlamydiaceae
Genus: Chlamydia
Species

Chlamydia muridarum Chlamydophila pneumoniae
Chlamydophila psittaci
Chlamydophila suis
Chlamydia trachomatis

Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

Chlamydia trachomatis, an obligate intracellular human pathogen, is one of four bacterial species in the genus Chlamydia.[1] C. trachomatis is a gram-negative bacterium, therefore its cell wall components retain the counter-stain safranin and appear pink under a light microscope.[2] It is ovoid in shape.[3] The inclusion bodies of Chlamydia trachomatis were first described in 1942; the Chlamydia trachomatis agent was first cultured in the yolk sacs of eggs by Professor Feifan Tang et al in 1957.[4][5]

C. trachomatis includes three human biovars:

Many, but not all, C. trachomatis strains have an extrachromosomal plasmid.[7]

Chlamydia can exchange DNA between its different strains, thus the evolution of new strains is common.[8]

Identification

Chlamydia species are readily identified and distinguished from other Chlamydia species using DNA-based tests.

Most strains of C. trachomatis are recognized by monoclonal antibodies (mAbs) to epitopes in the VS4 region of MOMP.[9] However, these mAbs may also cross-react with two other Chlamydia species, C. suis and C. muridarum.

Life-cycle

File:Chlamydae Life Cycle.svg
Life Cycle

Clinical significance

Clinical signs and symptoms of C. trachomatis infection and Gonorrhea infection are indistinguishable.C. trachomatis is the single most important infectious agent associated with blindness (trachoma); approximately 84 million worldwide suffer C. trachomatis eye infections and 8 million are blinded as a result of the infection.[10]

Laboratory tests

  • Nucleic acid amplification tests (NAAT). These tests find the genetic material (DNA) of Chlamydia bacteria. These tests are the most sensitive tests available, meaning that they are very accurate and that they are very unlikely to have false-negative test results. A polymerase chain reaction (PCR) test is an example of a nucleic acid amplification test. This test can also be done on a urine sample.
  • Nucleic acid hybridization tests (DNA probe test). A probe test also finds Chlamydia DNA. A probe test is very accurate but is not as sensitive as nucleic acid amplification tests.
  • Enzyme-linked immunosorbent assay (ELISA, EIA). This quick test finds substances (Chlamydia antigens) that trigger the immune system to fight Chlamydia infection.
  • Direct fluorescent antibody test (DFA). This quick test also finds Chlamydia antigens.
  • Chlamydia cell culture. A test in which the suspected chlamydia sample is grown in a vial of cells. The pathogen infects the cells and after a set incubation time (48 hours) the vials are stained and viewed on a fluorescent light microscope. Cell culture is more expensive and takes longer (two days) than the other tests. The culture must be grown in a laboratory.[11]


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References

  1. Ryan KJ, Ray CG (editors) (2004). Sherris Medical Microbiology (4th ed.). McGraw Hill. pp. 463–70. ISBN 0-8385-8529-9.
  2. "Chlamydia". MicrobeWiki. Department of Biology, Kenyon College. 2006-08-15. Retrieved 2008-10-27.
  3. Malhotra M, Sood S, Mukherjee A, Muralidhar S, Bala M (September 2013). "Genital Chlamydia trachomatis: an update". Indian J. Med. Res. 138 (3): 303–16. PMC 3818592. PMID 24135174.
  4. Darougar S, Jones BR, Kinnison JR, Vaughan-Jackson JD, Dunlop EM (December 1972). "Chlamydial infection. Advances in the diagnostic isolation of Chlamydia, including TRIC agent, from the eye, genital tract, and rectum". Br J Vener Dis. 48 (6): 416–20. doi:10.1136/sti.48.6.416. PMC 1048360. PMID 4651177.
  5. Tang FF, Huang YT, Chang HL, Wong KC (1958). "Further studies on the isolation of the trachoma virus". Acta Virol. 2 (3): 164–70. PMID 13594716.
    Tang FF, Chang HL, Huang YT, Wang KC (June 1957). "Studies on the etiology of trachoma with special reference to isolation of the virus in chick embryo". Chin Med J. 75 (6): 429–47. PMID 13461224.
    Tang FF, Huang YT, Chang HL, Wong KC (1957). "Isolation of trachoma virus in chick embryo". J Hyg Epidemiol Microbiol Immunol. 1 (2): 109–20. PMID 13502539.
  6. Fredlund H, Falk L, Jurstrand M, Unemo M (2004). "Molecular genetic methods for diagnosis and characterisation of Chlamydia trachomatis and Neisseria gonorrhoeae: impact on epidemiological surveillance and interventions". APMIS : acta pathologica, microbiologica, et immunologica Scandinavica. 112 (11–12): 771–84. doi:10.1111/j.1600-0463.2004.apm11211-1205.x. PMID 15638837.
  7. Carlson JH, Whitmire WM, Crane DD; et al. (June 2008). "The Chlamydia trachomatis Plasmid Is a Transcriptional Regulator of Chromosomal Genes and a Virulence Factor". Infection and immunity. 76 (6): 2273–83. doi:10.1128/IAI.00102-08. PMC 2423098. PMID 18347045.
  8. Harris SR, Clarke IN, Seth-Smith HM; et al. (April 2012). "Whole-genome analysis of diverse Chlamydia trachomatis strains identifies phylogenetic relationships masked by current clinical typing". Nat. Genet. 44 (4): 413–9, S1. doi:10.1038/ng.2214. PMC 3378690. PMID 22406642.
  9. Ortiz L, Angevine M, Kim SK, Watkins D, DeMars R (2000). "T-Cell Epitopes in Variable Segments of Chlamydia trachomatis Major Outer Membrane Protein Elicit Serovar-Specific Immune Responses in Infected Humans". Infect. Immun. 68 (3): 1719–23. doi:10.1128/IAI.68.3.1719-1723.2000. PMC 97337. PMID 10678996.
  10. "Trachoma". Prevention of Blindness and Visual Impairment. World Health Organization.
  11. "Chlamydia Tests". Sexual Conditions Health Center. WebMD. Retrieved 2012-08-07.
  12. 12.0 12.1 12.2 12.3 12.4 12.5 "Public Health Image Library (PHIL)".

Further reading

Bellaminutti, Serena; Seracini, Silva; De Seta, Francesco; Gheit, Tarik; Tommasino, Massimo; Comar, Manola (November 2014). "HPV and Chlamydia trachomatis Co-Detection in Young Asymptomatic Women from High Incidence Area for Cervical Cancer". Journal of Medical Virology. 86 (11): 1920–1925. doi:10.1002/jmv.24041. Retrieved 13 November 2014.

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