The U.S. measles outbreak now includes at least 102 infected people in 14 states. Most of the cases have been tied to Disneyland in Southern California. The outbreak has many people wondering why a disease that was eradicated from the United States in the year 2000 is now infecting so many people, and what role vaccination requirements may have had in the outbreak. We asked experts to explain how the vaccine works and why the outbreak is happening now.
Most of the cases of measles reported so far in 2015 are part of a large, ongoing outbreak linked to Disneyland in Anaheim, California, according to the California Department of Public Health(CDPH).