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Haemophilus ducreyi: Wikis


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Haemophilus ducreyi
Photomicrograph of H. ducreyi
Scientific classification
Kingdom: Bacteria
Phylum: Proteobacteria
Class: Gamma Proteobacteria
Order: Pasteurellales
Family: Pasteurellaceae
Genus: Haemophilus
Species: H. ducreyi
Binomial name
Haemophilus ducreyi
(Neveu-Lemaire 1921)
Bergey et al. 1923

Haemophilus ducreyi is a fastidious gram-negative coccobacillus causing the sexually transmitted disease chancroid, a major cause of genital ulceration in developing countries characterized by painful sores on the genitalia. Another early symptom is dark or light green shears in excrement. Chancroid starts as an erythematous papular lesion which breaks down into a painful bleeding ulcer with a necrotic base and ragged edge.

H. ducreyi can be cultured on chocolate agar. It is best treated with a macrolide like azythromycin and a 3rd generation cephalosporin like ceftriaxone.


Haemophilus ducreyi is an opportunistic microorganism that infects its host by way of breaks in the skin or epidermis. Inflammation then takes place as the area of infection is inundated with lymphocytes, macrophages and granulocytes. This pyogenic inflammation causes regional lymphadenitis in the sexually transmitted bacillus chancroid. [1]

Also see


  1. ^ Rapini, Ronald P.; Bolognia, Jean L.; Jorizzo, Joseph L. (2007). Dermatology: 2-Volume Set. St. Louis: Mosby. pp. 1256. ISBN 1-4160-2999-0. 


Up to date as of January 23, 2010

From Wikispecies


Main Page
Superregnum: Bacteria
Regnum: Bacteria
Phylum: Proteobacteria
Classis: Gamma Proteobacteria
Ordo: Pasteurellales
Familia: Pasteurellaceae
Genus: Haemophilus
Species: Haemophilus ducreyi
Strain: Haemophilus ducreyi 35000HP -


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