FILE - In this June 9, 2015, file photo, Karman Willmer, left, and Shelby Messenger rally against SB 277, a California measure requiring schoolchildren to get vaccinated, outside the Capitol in Sacramento, Calif. California's Assembly on Thursday, June 25, 2015, approved a hotly contested bill requiring that nearly all public schoolchildren be vaccinated, clearing one of its last major legislative obstacles before the measure heads to the desk of Gov. Jerry Brown. The bill aims to increase immunization rates after a measles outbreak linked to Disneyland in December sickened over 100 people in the U.S. and Mexico. (AP Photo/Rich Pedroncelli, File)

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