The number of measles cases from the outbreak linked to Disneyland has now risen to at least 98. But measles remains extremely rare in the United States.
The rest of the world hasn't been so fortunate. Last year roughly 250,000 people came down with measles; more than half of them died.
Currently the Philippines is experiencing a major measles outbreak that sickened 57,000 people in 2014. China had twice that many cases, although they were more geographically spread out. Major outbreaks were also recorded in Angola, Brazil, Ethiopia, Indonesia and Vietnam.