California Gov. Jerry Brown signed into law one of the strictest vaccination requirements in the country in an attempt to ensure widespread outbreaks—like the recent Disneyland measles debacle—don’t occur again.

The bill—SB 277—passed the California state legislature this week, despite fierce opposition from virulent and sometimes violent anti-vaxxers. (Anna Merlan takes an in-depth look at the increasingly unhinged movement over at Jezebel).

The bill essentially requires all public schoolchildren to be vaccinated unless they receive a medical exemption.

Despite the often outspoken opposition, Brown says he’s confident because of, well, science.

“The science is clear that vaccines dramatically protect children against a number of infectious and dangerous diseases,” Brown wrote. “While it’s true that no medical intervention is without risk, the evidence shows that immunization powerfully benefits and protects the community.”

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