SPRINGFIELD – The Illinois Department of Public Health announced Monday that the number of measles cases in Illinois in 2025 reached six. Two new cases in Southern Illinois were confirmed over the weekend, adding to two in the Marion area that were identified in April. Two unrelated cases were previously confirmed in Cook County.
One of the new cases was confirmed over the weekend is in the Franklin-Williamson Bi-County area. This now meets the technical Center for Disease Control and Prevention definition of an “outbreak” in that area (three or more cases that are linked to one another). Social links between the three cases are known.
“The risk to the general public from measles remains low,” said IDPH Director Dr. Sameer Vohra. “The key to preventing measles is the highly effective MMR vaccine. Two doses are 97% effective in preventing this serious infection. I recommend that our Illinois residents make sure they and their family members are up to date on the MMR vaccine and all other age-appropriate immunizations.”
Current information on potential sites where infected individuals may have exposed others can be found on the IDPH website at Measles Exposure Locations. This will be updated as the Department gets more information.
