California has some of the strictest laws in the country requiring childhood immunizations in order to attend public or private schools. Since a 2015 law, the state has allowed for exemptions from required shots only if a doctor says there is a medical reason to skip some or all of them. Previously, parents could opt their children out of vaccinations by citing a personal or religious belief, as most states allow.

Source: Los Angeles Times May 22, 2019 19:34 UTC