Haemophilus ducreyi

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

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This page is about microbiologic aspects of the organism(s). For clinical aspects of the disease, see Chancroid.

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

Haemophilus ducreyi is a fastidious Gram-negative coccobacillus causing the chancroid characterized by painful sores on the genitalia.

Haemophilus ducreyi, also known as H. ducreyi, is a fastidious, gram-negative, coccobacillus that causes the sexually transmitted disease chancroid, characterized as a genital ulcerative disease.^[1]
H. ducreyi can range from short to relatively long bacilli with rounded ends, and typically grow in chains.
H. ducreyi was originally classified as a Haemophilus species due to its growth requirements and antigentic relatedness to other species in the genus. However, rRNA analysis indicates H. ducreyi is not a true Haemophilus but is more closely related to the Pasteurellaceae family.^[2]
Due to its complex growth requirements H. Ducreyi is difficult to culture.^[3]
The genome of H. ducreyi is a single 1.7-Mb chromosome.

↑ Chancroid in Emergency Medicine. Medscape (February 12, 2014). http://emedicine.medscape.com/article/781520-overview#showall Accessed January 12, 2016.
↑ Spinola, S. M. (2002). "Immunopathogenesis of Haemophilus ducreyi Infection (Chancroid)". Infection and Immunity. 70 (4): 1667–1676. doi:10.1128/IAI.70.4.1667-1676.2002. ISSN 0019-9567.
↑ Lewis, D A (2003). "Chancroid: clinical manifestations, diagnosis, and management". Sexually Transmitted Infections. 79 (1): 68–71. doi:10.1136/sti.79.1.68. ISSN 1368-4973.