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Encyclopedia > Haemophilus ducreyi
Haemophilus ducreyi
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gamma Proteobacteria
Order: Pasteurellales
Family: Pasteurellaceae
Genus: Haemophilus
Species: ducreyi
Binomial name
Haemophilus ducreyi

A chancroid is an STD characterized by painful sores on the genitalia. Chancroid is a disease known to be spread solely through sexual contact.



Chancroid is a bacterial infection caused by the organism Haemophilus ducreyi. It is a disease found primarily in developing countries.

Only a few hundred cases a year are diagnosed in the United States. The majority of individuals in the U.S. diagnosed with chancroid have traveled outside the country to areas where the disease is known to occur frequently.

Uncircumcised men are at 3 times greater risk than circumcised men for contracting chancroid from an infected partner. Chancroid is a risk factor for contracting HIV.

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 2 inches 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

About half of infected men have only a single ulcer. Women frequently have 4 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

Common locations in women

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.

External links

  • http://www.emedicine.com/EMERG/topic95.htm
  • http://www.nlm.nih.gov/medlineplus/ency/article/000635.htm

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Haemophilus influenzae, the major pathogen, can be separated into encapsulated or typable strains, of which there are seven types (a through f including e') based on the antigenic structure of the capsular polysaccharide, and unencapsulated or nontypable strains.
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The sodA gene of Haemophilus ducreyi encodes a hydrogen peroxide-inhibitable superoxide dismutase.
Haemophilus ducreyi is the etiologic agent of the sexually transmitted disease chancroid, an ulcerative condition implicated in increased HIV transmission.
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