Chancroid pathophysiology
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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Yazan Daaboul, M.D.; Nate Michalak, B.A.; Serge Korjian M.D.
Overview
Pathophysiology
Transmission
- Chancroid may develop after transmission of class I or class II of the bacterium Haemophilus ducreyi through sexual contact.[1]
- A class I gentically distinct subclade strain of H. ducreyi may serve as the etiologic agent of non-sexually transmitted skin ulcers.[2][3]
Pathogenesis
- H. ducreyi enters the skin through breaks in the epithelium.
- H. ducreyi is thought to bind with epithelial cells and then colonize in the subcutaneous tissue.[4]
- H. ducreyi recruits inflammatory cells to the infected area and induces secretion of interleukin 6 (IL-6) and interleukin 8 (IL-8) from epithelial cells. IL-8 induces neutrophils and macrophages to form abscesses, which may cause the presentation of erythematous papules which progress into intradermal pustules.[4][5][6]
- Ulcers develop after secretion of the virulence factor H. ducreyi cytolethal distending toxin (HdCDT), which causes necrosis of myeloid and epithelial cells.[6] The pathogenesis of ulceration is not fully understood but may involve release of toxic products by H. ducreyi or bacterial-induced inflamation.[4]
- It is presumed that iron plays an essential role in chancroid pathogenesis.[4]
References
- ↑ Chancroid. MedlinePlus (Decemner 2, 2015). https://www.nlm.nih.gov/medlineplus/ency/article/000635.htm Accessed January 6, 2015.
- ↑ Marks M, Chi KH, Vahi V, Pillay A, Sokana O, Pavluck A; et al. (2014). "Haemophilus ducreyi associated with skin ulcers among children, Solomon Islands". Emerg Infect Dis. 20 (10): 1705–7. doi:10.3201/eid2010.140573. PMC 4193279. PMID 25271477.
- ↑ Gaston JR, Roberts SA, Humphreys TL (2015). "Molecular phylogenetic analysis of non-sexually transmitted strains of Haemophilus ducreyi". PLoS One. 10 (3): e0118613. doi:10.1371/journal.pone.0118613. PMC 4361675. PMID 25774793.
- ↑ 4.0 4.1 4.2 4.3 Abeck D, Johnson AP (1992). "Pathophysiological concept of Haemophilus ducreyi infection (chancroid)". Int J STD AIDS. 3 (5): 319–23. PMID 1391058.
- ↑ Chancroid. Wikipedia (July 16, 2015). https://en.wikipedia.org/wiki/Chancroid Accessed on January 6, 2016.
- ↑ 6.0 6.1 Chancroid in Emergency Medicine. Medscape (February 12, 2014). http://emedicine.medscape.com/article/781520-overview#a5 Accessed January 8, 2016.