Chancroid is a bacterial sexually transmitted infection (STI) caused by *Haemophilus ducreyi*. It is characterized by painful genital ulcers and primarily affects individuals engaging in unprotected sexual activity, particularly in regions with limited resources and specific populations globally. While less common in developed countries today, it remains a public health concern.
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Chancroid has been recognized as a distinct venereal disease for centuries, often confused with syphilis due to similar lesions. The causative bacterium, *Haemophilus ducreyi*, was first identified in 1889 by the Italian microbiologist Augusto Ducrey. Historically, it was a significant cause of genital ulcer disease worldwide and is known to facilitate HIV transmission.
Chancroid spreads primarily through sexual contact, specifically via direct skin-to-skin or mucous membrane contact with the open sores or infected fluid from an ulcer of an infected person. The bacteria can enter the body through any small breaks in the skin or mucous membranes during sexual activity. It is not typically transmitted through casual, non-sexual contact.
Contagious Period: Varies by disease
Local health department information and state-specific prevention guidance
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Whether you live in Connecticut or are traveling there, knowing the symptoms, timeline, and when to seek care helps you act quickly if exposure occurs.
Seek care if you experience severe dehydration, bloody stools, high fever, or symptoms lasting more than 3 days. Children under 5, adults over 65, and immunocompromised individuals should seek care earlier.
Emergency symptoms: Severe dehydration, inability to keep fluids down for 12 or more hours, or neurological symptoms require emergency care.
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Global disease surveillance and guidelines from the World Health Organization
View WHO Resources →Disease information on Virus Watcher is reviewed by our Chief Epidemiologist, a former CDC lead analyst for FluSight forecasting. Outbreak data is aggregated from verified sources including BEACON, ProMED, WHO, CDC, and 50+ national health agencies. This information is for educational purposes and should not replace professional medical advice.
Last reviewed: 2026-07-18
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