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California, and I assume most other states, offer vaccine exemptions to parents. According to this excerpt from teh LA TImesin 2009, about 2% of Kindergarteners now use the waiver to get in without being vaccinated. I assume the number now is higher, and also some parents probably don't get the waiver and just fake the forms..

In all, more than 10,000 kindergartners started school last fall with vaccine exemptions, up from about 8,300 the previous school year. In 1997, when enrollment was higher, the number of exempted kindergartners was 4,318.
Statewide, only 2% of kindergartners had exemptions. But The Times found they were enrolled in a relatively small number of schools. Parents who sign affidavits saying vaccines are “contrary to my beliefs” are most likely to send their children to schools in affluent areas -- many of them public charter schools and non-Catholic private schools.