Measles is highly contagious and spreads through the air when an infected person coughs or sneezes. It is so contagious that if one person has it, 9 out of 10 people around him or her will also become infected if they are not protected. You can get measles just by being in a room where a person with measles has been, even up to two hours after that person has left. An infected person can spread measles to others even before he or she develops symptoms -- from four days before they develop the measles rash through four days afterward.
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