Support WBURMeasles + Low Vaccination Rates = Big Headaches For SchoolsPlay03:50Download AudioKirk SieglerFebruary 04, 2015 ShareCalifornia is one of 20 states that allow parents to opt out of vaccination requirements for reasons of "personal belief." About 10 percent of students in the Santa Monica-Malibu school district are not immunized. (Getty Images)
