Story highlights Dr. Richard Pan also wrote law that requires parents have health care professional sign form for exemption

He says public needs more protection that bill would provide

California has 99 confirmed cases of measles

(CNN) Two state senators in California are proposing legislation that would eliminate the "personal beliefs" exemption for parents who don't want their children to be vaccinated.

Dr. Richard Pan and Ben Allen's announcement came on the day the state of California announced the number of measles cases had grown to 99. Many of those cases are tied to an outbreak at Disneyland in mid-December.

The comparatively large number of cases in California this year and in the United States the past year have sparked debate over whether unvaccinated children should be allowed in public school.

California allows exemptions from vaccinations for medical reasons and "personal beliefs," and parents have been using them.

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