Travelers with confirmed cases of measles passed through five U.S. airports this month and exposed an unknown number of passengers to the disease, ABC News reports, citing city health officials.
Why it matters: The Centers for Disease Control and Prevention says measles, a highly contagious virus that can spread from an infected person through coughing and sneezing, can live for up to two hours in an airspace where the the person coughed or sneezed.
