The California senate has passed a bill that requires most children in public schools to get vaccinations and ends exemptions from vaccinations for personal beliefs.
The bill only allows for kids with serious health problems to not get vaccinated.
The bill is now heading to California Governor Jerry Brown, who has not said whether he will sign the bill. It would be one of the strictest vaccination laws in the country.
California recently experienced an outbreak of measles that was tied to a Disneyland amusement park. Many of the people infected were not vaccinated.