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March 26, 2016
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1 Introduction



DiseaseDisorder infobox |
Name = Chancroid |
ICD10 = A57 |
ICD9 = 099.0 |

Taxobox_begin | color = lightgrey | name = Haemophilus ducreyi
<!-- Taxobox_image | image = | caption = -->
Taxobox_begin_placement | color = lightgrey
Taxobox_regnum_entry | taxon = Bacterium|Bacteria
Taxobox_phylum_entry | taxon = Proteobacteria
Taxobox_classis_entry | taxon = Gamma Proteobacteria
Taxobox_ordo_entry | taxon = Pasteurellaceae|Pasteurellales
Taxobox_familia_entry | taxon = Pasteurellaceae
Taxobox_genus_entry | taxon = Haemophilus
Taxobox_species_entry | taxon = H. ducreyi
Taxobox section binomial botany | color = lightgrey | binomial_name = Haemophilus ducreyi | author = (Neveu-Lemaire 1921) David Hendricks Bergey|Bergey et al. 1923
Chancroid is a sexually transmitted disease characterized by painful sores on the genitalia. Chancroid is known to be spread from one to another individual solely through sexual contact.

Chancroid is a bacterium|bacterial infection caused by the organism Haemophilus ducreyi. It is a disease found primarily in developing countries, there associated with commercial sex workers and their clientele.

Infection levels are low in the western world, typically around one case per two million of the population (Canada, France, UK and USA). Most individuals diagnosed with chancroid have visited countries or areas where the disease is known to occur frequently, although outbreaks have been observed in association with crack cocaine use and prostitution.

Uncircumcised men are at three times greater risk than circumcised men for contracting chancroid from an infected partner. Chancroid is a risk factor for contracting HIV, due to the ecologic association or shared risk of exposure, and due to facilitated transmission of one by the other.

After an incubation period of one day to two weeks, chancroid begins with a small bump that becomes an ulcer within a day of its appearance. The ulcer characteristically:

  • Ranges in size dramatically from 1/8 inch to two inches (3 to 50 mm) across

  • Is painful

  • Has sharply defined, undermined borders

  • Has irregular or ragged borders

  • Has a base that is covered with a grey or yellowish-grey material

  • Has a base that bleeds easily if traumatized or scraped

More specifically, the CDC's standard clinical definition for a probable case of chancroid includes all of the following:

  • Patient has one or more painful genital ulcers. The combination of a painful ulcer with tender adenopathy is suggestive of chancroid; the presence of suppurative adenopathy is almost pathognomonic.

  • No evidence of Treponema pallidum is indicated by dark-field examination of ulcer or by a serologic test for Syphilis performed at least 7 days after the onset of ulcer.

  • The clinical presentation is not typical of disease caused by human herpesvirus 2 (Herpes Simplex Virus), or result of culture for HSV is negative.

About half of infected men have only a single ulcer. Women frequently have four or more ulcers, with fewer symptoms. The ulcers appear in specific locations, such as the coronal sulcus of the uncircumcised glans penis in men, or the fourchette and labia minora in women.

  • Foreskin (prepuce)

  • Groove behind the head of the penis (coronal sulcus)

  • Shaft of the penis

  • Head of the penis (glans penis)

  • Opening of the penis (urethral meatus)

  • Scrotum

In women the most common location for ulcers is the labia majora. "Kissing ulcers" may develop. These are ulcers that occur on opposing surfaces of the labia. Other areas such as the labia minora, perianal area, and inner thighs may also be involved. The most common symptoms in women are pain with urination and pain with intercourse.

The initial ulcer may be mistaken as a "hard" chancre, the typical sore of primary syphilis, as opposed to the "soft chancre" of chancroid.

Approximately one third of the infected individuals will develop enlargements of the inguinal lymph nodes, the nodes located in the fold between the leg and the lower abdomen.

Half of those who develop swelling of the inguinal lymph nodes will progress to a point where the nodes rupture through the skin producing draining abscesses. The swollen lymph nodes and abscesses are often referred to as buboes.

  • http://www.emedicine.com/EMERG/topic95.htm

  • http://www.nlm.nih.gov/medlineplus/ency/article/000635.htm

Category:Sexually-transmitted diseases

fr:Chancre mou
pt:Cancro mole

This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Chancroid".

Last Modified:   2005-12-19

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