Health Officials Investigate Measles Case Linked to Milwaukee Airport
In a joint effort, the Wisconsin Department of Health Services (DHS), City of Milwaukee Health Department, and Walworth County Department of Health and Human Services are currently investigating a measles case associated with Milwaukee Mitchell International Airport. The individual contracted the virus while traveling, with the case connected to another confirmed instance in a different state. Meanwhile, the presence of measles in untreated wastewater in Walworth County has also been confirmed, marking a first for the region.
Authorities have clarified that this case is unrelated to the existing cases in Waukesha County and Dane County. Due to privacy concerns, specific personal details about the individual will not be disclosed.
Efforts are underway to reach and inform individuals who may have come into contact with the virus. The investigation has pinpointed a public exposure location: travelers on Flight WN 266 from Phoenix to Milwaukee, as well as those present at Milwaukee Mitchell International Airport on January 29, 2026, from 10:31 p.m. to 12:31 a.m., might have been exposed.
Currently, no public exposure sites have been identified in Walworth County. Updates on potential exposure locations will be available on the DHS Outbreaks and Investigations webpage.
Measles, a highly infectious virus, can spread through the air and linger for up to two hours after an infected person coughs or sneezes. If unchecked, the virus can infect up to 90% of those nearby who are not vaccinated. Symptoms, appearing 10 to 21 days post-exposure, include:
- Runny nose
- High fever (potentially exceeding 104°F)
- Tiredness
- Cough
- Red, watery eyes, or conjunctivitis (“pink eye”)
- A red rash with raised bumps starting at the hairline and spreading to the arms and legs three to five days after symptom onset
The disease can lead to severe complications such as pneumonia, brain damage, and deafness, and can be fatal. In the U.S., one in four measles patients require hospitalization. Individuals exhibiting symptoms should remain at home and contact their healthcare provider before visiting, to prevent further exposure.
The measles, mumps, rubella vaccine (MMR) is a preventive measure, showing 97% efficacy with two doses. DHS advises Wisconsin residents to verify their vaccination records to safeguard themselves and their families. Generally, individuals born before 1957 are considered immune. Others should receive at least one dose, while children need two. More details about vaccination can be found on the DHS measles webpage.
Vaccination records can be checked via the Wisconsin Immunization Registry, or by contacting healthcare providers or local health departments. Vaccinations are available at healthcare providers, clinics, or pharmacies, with local health departments offering guidance on necessary vaccines. Free assistance in finding a healthcare provider is available by dialing 211. Pregnant individuals, children under 12 months, or those unable to receive the MMR vaccine are advised to consult their healthcare provider.
This investigation is ongoing, with updates on public exposure locations to be disseminated widely and posted on the DHS Outbreaks and Investigations page.
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