School started in Los Angeles Unified schools Tuesday, with strict new vaccination requirements for students in place. Public and private school students in all of California must now be vaccinated against up to 10 diseases, including measles, mumps, whooping cough, and chickenpox. That’s because of the new state law that took effect this summer, which is one of the strictest in the nation. Gone are the days of personal belief exemptions, allowing kids to go unvaccinated because of religion or other non-health related reasons. Now a medical waiver is the only excuse.