Measles is a highly contagious virus found throughout the world. People get measles by breathing in the measles virus that is spread when an infected person.
Causes. Measles is a highly contagious illness caused by a virus that replicates in the nose and throat of an infected child or adult. Then, when.
In the U.S., about 1 in 4 people who get measles end up in the hospital. Children under age 5 and adults over age 20 tend to have the worst.
Although it's often associated with childhood illness, adults can get measles too. People who aren't vaccinated are at a higher risk of.