Health officials are urgently warning the public about a potential measles exposure at Chicago O’Hare International Airport after an infected adult spent two days in Terminal 1. The individual, who had received one prior dose of the MMR vaccine, was contagious while at the airport o
n April 22 and 23 between 10 a.m. and 8 p.m. each day. Measles, one of the world’s most contagious diseases, can linger in the air for hours, raising concerns that hundreds of travelers may have been exposed. The infected person later developed a rash on April 25 and has since been isolating at home.