Columbia County in Wisconsin has confirmed three measles cases, prompting a public health investigation as infections continue to spread across the state. Columbia County Public Health confirmed the cases on November 4, 2026. Health officials are identifying people who may have been exposed and contacting them directly. According to authorities, all confirmed and suspected cases identified so far involve individuals who were not vaccinated against measles. Officials said no public exposure locations have been identified, with known exposures limited to private gatherings. Wisconsin’s Department of Health Services reported 431 confirmed measles cases statewide as of November 3. The state has been monitoring infections across multiple counties and coordinating investigations with local health departments. Wisconsin Department of Health Services +1 Measles is a highly contagious viral disease that spreads through the air when an infected person breathes, coughs or sneezes. The virus can remain infectious in the air for up to two hours after an infected person leaves an area. Symptoms include fever, cough, runny nose, red and watery eyes, and a rash that typically begins on the face and spreads across the body. Complications can include pneumonia, brain inflammation and hearing loss. Young children, pregnant women and people with weakened immune systems may face a greater risk of severe illness. Health officials advise people to check their measles vaccination status. Anyone experiencing symptoms should contact a healthcare provider before visiting a medical facility, allowing staff to take precautions against further transmission.

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