The Brief A second measles case this year was reported in suburban Cook County, involving an unvaccinated 4-year-old who likely contracted the illness during international travel. Anyone in Terminal 5 at O’Hare International Airport on Sept. 11 between 7:30 a.m. and 11 a.m. may have been exposed, officials said. Health officials urge people to review their measles vaccination status, watch for symptoms such as rash and fever, and contact a doctor before seeking in-person care if symptoms appear. Cook County health officials have confirmed a second case of measles so far this year. What you can do:Those who think they may have been exposed should review their measles, mumps and rubella (MMR) vaccination history with their health care provider.