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Story summary
- Cook County health officials warn of possible measles exposures at O'Hare International Airport, Terminal 5, on March 24.
- Exposures occurred at Fresh Farms and Marshalls in Niles on March 26.
- The measles virus can remain airborne for up to two hours.
- Symptoms may appear 7 to 21 days after exposure.
- The MMR vaccine provides 97% protection against measles.
