What is measles?
Measles is one of the most contagious diseases, which means it spreads easily through the air from an infected person to others. In fact, an infected person can spread it to 9 out of 10 people they expose if those people are not immune.
Measles can make you very sick with a fever, cough, runny nose, and a rash. Sometimes it can cause serious problems like pneumonia, hearing loss, encephalitis or rarely even death.