With California's strict vaccine mandate now in place, opponents are fighting to overturn the law in court.
The new law, which took effect Friday, bars parents from citing religion or other personal beliefs as reasons to not vaccinate their kids.
Parents and a nonprofit group filed suit to overturn the law in U.S. District Court in San Diego. The suit claims that the law violates children's right to an education. The plaintiffs are seeking a preliminary injunction to suspend the law while the case is decided.
The new law requires children entering school or day care be vaccinated against measles, mumps, whooping cough and other diseases.
