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Chancroid (Haemophilus ducreyi)
1990 Case Definition

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 one or more painful genital ulcers and both a) no evidence of Treponema pallidum infection by darkfield examination of ulcer exudate or by a serologic test for syphilis performed at least 7 days after onset of ulcers, and b) the clinical presentation of the ulcer(s) is not typical of disease caused by herpes simplex virus (HSV), or HSV culture is negative


A case that is laboratory confirmed