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Chancroid (Haemophilus ducreyi)
1996 Case Definition

CSTE Position Statement(s)

  • 09-ID-31

Clinical Description

A sexually transmitted disease characterized by painful genital ulceration and inflammatory inguinal adenopathy. The disease is caused by infection with Haemophilus ducreyi.

Laboratory Criteria for Diagnosis

Isolation of H. ducreyi from a clinical specimen

Case Classification


A clinically compatible case with both a) no evidence of Treponema pallidum infection by darkfield microscopic examination of ulcer exudate or by a serologic test for syphilis performed greater than or equal to 7 days after onset of ulcers and b) either a clinical presentation of the ulcer(s) not typical of disease caused by herpes simplex virus (HSV) or a culture negative for HSV.


A clinically compatible case that is laboratory confirmed


The 1996 case definition appearing on this page was re-published in the 2009 CSTE position statement 09-ID-31. Thus, the 1996 and 2010 versions of the case definition are identical.