23 cases in the past 6 months.
Data as of Oct 3, 2026.
Illinois has recorded 23 measles cases in the past six months. Figures are compiled from state and local health departments, the CDC, and local news, and update automatically as new reports come in.
Cases (past 6 months)
NBC Chicago reported 23 confirmed measles cases in Illinois in 2026, including a second confirmed case in Kane County — a vaccinated individual diagnosed after contact with the initial patient. IDPH also listed exposure locations including Chicago Union Station.
The Illinois Department of Public Health reported 23 confirmed measles cases in Illinois in 2026 to date, mainly driven by an outbreak in Douglas and Moultrie Counties (16 cases).