Measles Outbreaks Erupt Across Three States as Health Officials Urge Immediate Vaccination

Measles cases are being reported across Wisconsin, Illinois and Kentucky. Wisconsin health officials confirmed infections in six counties since August and urged residents to watch for symptoms and contact a health care provider if they become ill. Illinois has recorded 23 cases in 2026, including 16 tied to an outbreak in Douglas and Moultrie counties; officials say the overall risk remains low but are promoting vaccination and monitoring possible exposure sites. Kentucky’s statewide total reached 67, including 63 cases in the ongoing outbreak, with seven hospitalizations and no reported deaths; most cases involve people whose vaccination status is unknown or who are unvaccinated. Health officials in the affected states advise people to check their MMR vaccination records and contact a provider or local health department if they may have been exposed or develop symptoms.
Wisconsin health officials say measles can remain airborne for up to two hours after an infected person leaves an area and can cause serious complications, including pneumonia, brain damage and deafness.
In Illinois, local health departments have administered more than 200 MMR vaccine doses since the central Illinois outbreak began; two MMR doses are about 97% effective against measles, while one dose is about 93% effective.
Illinois officials identified Chicago’s Union Station and the Salt + Smoke restaurant in Edwardsville as potential exposure locations; two confirmed cases involved people who traveled through Union Station on Sept. 10, 12 and 13.
Kentucky’s case breakdown shows 11 cases among children younger than 5, 28 among people ages 5–17 and 28 among adults; more than half of the reported cases were therefore in children and teens. The state dashboard combined 65 cases under “unknown/unvaccinated,” without distinguishing how many were known to be unvaccinated.
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