"Measles is a highly contagious disease. It can be serious for young children. Protect your child by making sure he or she is up to date on vaccinations, including before traveling abroad.Measles is a very contagious disease caused by a virus. Measles starts with a fever. Soon after, it causes a cough, runny nose, and red eyes. Then a rash of tiny, red spots breaks out. It starts at the head and spreads to the rest of the body. Measles can be serious for young children. It can lead to pneumonia, encephalitis (swelling of the brain), and death. Measles spreads through the air when an infected person coughs or sneezes. It is so contagious that if one person has it, 90% of the people around him or her will also become infected if they are not protected..."