Nine confirmed cases have been linked to Disneyland and Disney's California Adventure Park
California Adventure
| Credit: George Rose/Getty

The happiest place on earth is looking a little under the weather.

Nine confirmed cases of measles have been linked to Southern California’s Disneyland and its adjacent Disney California Adventure Park between Dec. 15 and Dec. 20, according to the California Department of Public Health. Three more cases are suspected but not confirmed.

The patients in the outbreak range in age from 8 months to 21 years old. Six of the nine confirmed cases involve individuals who were not vaccinated against the disease, though two of the babies were too young to have received their first inoculations. One person was fully vaccinated.

Paul Offit, chief of infectious disease at Children’s Hospital of Philadelphia, told USA Today that measles cases have jumped recently as more parents lapse in having their children vaccinated over rumors about the danger of vaccines.

Statistics from the Centers for Disease Control and Prevention number measles cases in 2014 at 554, up from 187 cases in 2013 and 55 in 2012.

The Disneyland outbreak is especially disturbing, Offit adds, because it’s such a hotbed of travelers, and infected people are likely to get on planes and spread the disease easily. For example, two of the nine confirmed cases were Utah residents.