Chancroid

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. more...

Causes

Chancroid is a 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.

Symptoms and signs

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.

Common locations in men (most common to least common)

• 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

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