How contagious is measles?

Measles is extremely contagious. The virus travels through the air and can stay up to two hours in the air of a room where a person with measles has been. If other people breathe the contaminated air or touch a contaminated surface, then touch their eyes, noses or mouths, they can become infected. Measles is so contagious that if one person has it, 90 percent of the people close to that person who are not immune will also become infected.

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1. What places have been identified as exposure sites?
2. What is measles?
3. What are the symptoms of measles?
4. How contagious is measles?
5. What should I do if I think I have the measles?
6. How serious is measles?
7. How can I prevent measles?
8. How many doses of the measles vaccine do I need?
9. How common is measles?
10. How is measles treated?