Parents who decline immunizations for their school children may be putting others at risk.
Catherine Martin of the California Immunization Coalition says as the percentage of un-vaccinated children rises, disease outbreaks will increase.
"We're seeing it with measles in some communities, pertussis, and much more chicken pox than we have seen in the past," Martin said.
Even so, the number of Sacramento-area kindergartners who aren't vaccinated rose 30 percent this year.
At the Community Outreach Academy, which serves many newcomers to the U.S., more than half of first-year students have exemptions.
"Until we can really educate parents about the importance of vaccinations, they're a little slow to have their children vaccinated," Jason Sample with the Community Outreach Academy said.
So the Academy is working with community leaders and hosting parent information nights.