Last December, several visitors to Disneyland in California got an unexpected surprise -- measles. An outbreak of measles started when at least 40 people who visited or worked at the park contracted the disease and spread it to nearly 100 more people in over half a dozen states. The Center for Disease Control declared the outbreak over on April 17, 2015.
Despite measles being almost eradicated in the United States, unvaccinated travelers to and from other countries can bring the disease back. People vaccinated against the disease have little to fear. However, more and more parents are deciding to not vaccinate their children.
In reaction to the outbreak, some states are considering bills that would require all children to be vaccinated.