🦠microbiology review

Chancroid

Written by the Fiveable Content Team • Last updated August 2025
Written by the Fiveable Content Team • Last updated August 2025

Definition

Chancroid is a bacterial infection caused by Haemophilus ducreyi, characterized by painful genital ulcers and swollen lymph nodes. It is a sexually transmitted infection (STI) that primarily affects the urogenital system.

5 Must Know Facts For Your Next Test

  1. Chancroid is caused by the gram-negative bacterium Haemophilus ducreyi.
  2. The primary symptom of chancroid is painful genital ulcers with irregular borders.
  3. It can lead to swollen, tender lymph nodes in the groin, often resulting in abscesses.
  4. Chancroid is diagnosed through clinical examination and confirmed by culturing H. ducreyi from ulcer exudates.
  5. Antibiotics such as azithromycin, ceftriaxone, ciprofloxacin, and erythromycin are effective treatments for chancroid.
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