MILL VALLEY, CA - JANUARY 26: In this photo illustration, vials of measles, mumps and rubella vaccine are displayed on a counter at a Walgreens Pharmacy on January 26, 2015 in Mill Valley, California. An outbreak of measles in California has grown to 68 cases with 48 of the cases being linked to people who had visited Disneyland. Nine additional cases have been reported in five states and Mexico. (Photo by Illustration Justin Sullivan/Getty Images)
