People visit Disneyland on January 22, 2015 in Anaheim, California. The theme park known as "The Happiest Place on Earth" for spreading happiness has a new contagion, measles, with an outbreak of 51 cases linked to Disneyland. California's deputy director of the state's Center for Infectious Diseases, Dr. Gil Chavez, has recommended children under the age of 12 months and people who have never received a measles vaccination stay away from the park while the disease event continues.  AFP PHOTO / FREDERIC J. BROWN        (Photo credit should read FREDERIC J. BROWN/AFP via Getty Images)