State senators passed a bill Thursday aimed at increasing California's school immunization rates after a measles outbreak at Disneyland last year. The bill was approved on a 25-10 vote after a series of emotional hearings this year at which opponents called for preserving parental rights on the matter. The measure would prohibit parents from seeking vaccine exemptions for their children because of religious or personal beliefs. The bill, which now goes to the Assembly, would make medical waivers available only for children who have health problems. Other unvaccinated children would have to be homeschooled.