Measles is a highly contagious respiratory disease caused by a
virus. It spreads through the air through coughing and sneezing. Measles
starts with a fever, runny nose, cough, red eyes, and sore throat, and
is followed by a rash that spreads all over the body. About three out of
10 people who get measles will develop one or more complications
including pneumonia, ear infections, or diarrhea. Complications are more
common in adults and young children.