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Chicago authorities warn of possible measles exposure at O’Hare

Officials are notifying potentially exposed people after a contagious case visited three public sites, and the MMR vaccine offers 97% protection, health officials said.

  • Cook County Department of Public Health issued a warning Tuesday regarding potential measles exposure at O'Hare International Airport and locations in Niles and Mount Prospect.
  • Exposure occurred at Terminal 5 on March 24, followed by visits to Fresh Farms and Marshalls in Niles on Thursday, March 26, and Endeavor Health Immediate Care Center in Mount Prospect on Friday, March 27.
  • Measles is a highly contagious respiratory virus that can remain in the air for up to two hours after an infected person leaves, with transmission requiring just 15 minutes of exposure.
  • Residents experiencing high fever, cough, runny nose, or rash should contact a healthcare provider before visiting a clinic, CCDPH officials advised, helping staff protect others from disease spread.
  • Two doses of the measles-mumps-rubella vaccine provide 97% protection, and officials urge those unvaccinated or unsure of their status to consult a provider as the most effective prevention.
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WFLD broke the news in Chicago, United States on Tuesday, March 31, 2026.
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