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. Track Chancroid activity and outbreaks specific to Wisconsin.
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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
Our AI-powered surveillance continuously monitors Chancroid activity across Wisconsin. We track data from state health departments, local hospitals, CDC reports, and 50+ global health sources to provide early warning of emerging threats.
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For official state health alerts, vaccination locations, and public health guidance specific to Wisconsin, visit your state health department's website.
Whether you live in Wisconsin, are traveling there, or have family in the state, understanding Chancroid prevention is essential. Follow these evidence-based prevention measures:
If you experience symptoms of Chancroid in Wisconsin, contact your healthcare provider immediately. Early diagnosis and treatment improve outcomes significantly.
Emergency symptoms: If you experience severe symptoms, difficulty breathing, or signs of dehydration, call 911 or go to your nearest emergency room.
Trusted information from leading health organizations
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: 2026-06-03
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