California parents who do not vaccinate their children would have to home-school them under a bill passed Thursday by the state Senate, the latest move in a battle between public health officials and “anti-vaxxers” who fear vaccines are dangerous. The bill, which eliminates the so-called personal beliefs exemption allowing parents to forego vaccinations if opposed to them for any reason, was introduced after a measles outbreak at Disneyland last year that sickened more than 100 people.