• Sexually transmitted genital ulcerative disease:
    • Increased risk for HIV infection
  • A common cause of painful genital ulceration in Africa, Southeast Asia, and Latin America:
    • Uncommon in the U.S. where herpes simplex virus (HSV) > syphilis >> chancroid, but likely underreported
    • Newly identified as causative agent in chronic cutaneous ulcers of the lower limb in children in the tropics in the Pacific islands


Causative agent: Haemophilus ducreyi
  • Highly infectious bacterium

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