NEW YORK — Measles has become relatively rare in the United States, thanks to very effective vaccine. A recent outbreak tied to Disneyland has shown that even among some doctors, knowledge of the once-common illness is spotty.

Some questions and answers about a still-dangerous disease that’s re-emerged as a leading public health concern:

Q: How dangerous is measles?

A: For most people, measles is miserable but not life-threatening. The most common symptoms include fever, runny nose, cough, and a rash all over the body. However, a very small fraction of people get much sicker, and can suffer complications like pneumonia and encephalitis. Before

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