Overview

• Health authorities said the patient is a 4-year-old who was not vaccinated, and the specific suburb was not disclosed.
• People who were in O'Hare International Airport's Terminal 5 on Sept. 11 between 7:30 a.m. and 11 a.m. may have been exposed.
• Cook County health officials are coordinating with the Illinois and Chicago health departments to identify and notify contacts.
• Individuals unsure of immunity should review vaccination records, call a provider before seeking in-person care if symptoms develop, and discuss post-exposure MMR if unvaccinated.
• Measles symptoms can take up to 21 days to appear, and two MMR doses provide about 97% protection with routine doses at 12–15 months and 4–6 years.