Chancroid (Haemophilus ducreyi)

Clinical criteria
Any person with the following clinical picture: chancroid is a sexually transmitted disease characterized by painful genital ulceration and inflammatory inguinal adenopathy

Laboratory criteria
Isolation of H. ducreyi from a clinical specimen

Epidemiological criteria

Case classification

A. Possible case
B. Probable case
Any person meeting the clinical criteria 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
C. Confirmed case
Any person meeting the clinical and the laboratory criteria

Current as of: 24 January 2019