Primative superstition called vaccination ineffective at Disneyland...

http://losangeles.cbslocal.com/2015/01/20/some-disney-cast-members-test-positive-for-measles-theme-park-confirms/

Orange County health officials said several park employees were diagnosed with measles. Of those, two had reportedly been vaccinated.
To date, up to 53 measles cases have been confirmed in California.