united flight 790 with a connecting flight to virginia. >> reporter: health officials are working to inform people who may have been exposed. >> it is important to remember that measles can be a deadly disease. >> reporter: in chicago health officials are investigating possible measles exposures around the same time at o'hare airport and two restaurants. the state of virginia is investigating possible exposures at the richmond airport and a doctor's office. on december 11th through children with measles visiting from new zealand likely exposed travelers at denver and los angeles international airports. the cdc is contacting passengers who flew on the same planes. the measles virus spreads through coughing and sneezing and could live in the air for up to two hours. symptoms include a high fever, cough, running nose, pink eye and of course a red splotchy rash. on average it takes about two weeks for the rash to develop. and a person is contagious for four days before and after the rash appears. best way to stay safe, receive