Measles
In the U.S., roughly one in five people who develop measles require hospitalization for one or more complications from the disease. Widespread introduction of vaccine has resulted in a reduction of measles incidence from 894,134 cases in 1941 to 89 cases in 1998, and only 44 cases in 2002.
Despite this great success, outbreaks can still occur. As of May 2008, more than 60 cases of measles were reported in the U.S., mainly among vaccine objectors. At least 11 of those cases were traced back to a young, unvaccinated boy who traveled to Europe on vacation with his family where he contracted measles, which he brought home to the United States. The kids who were infected by this boy included two siblings, two friends of the siblings, three playmates from his school, and four children from his pediatrician's office. This clearly illustrates that vaccine preventable diseases are only a plane ride away.