Jerry Brown, Governor of California, passed legislation that requires schoolchildren in the state to be vaccinated, unless they have strong medical grounds for not doing so.
The law implies that parents would not be able to use the personal choice narrative to refuse vaccination for their children over religious or philosophical reasons.
The bill, SB277, was introduced in the interest of public health after a large measles outbreak that originated at the Disneyland theme park in the state in December 2014, affecting more than 160 people across the country.
Anti-vaccine groups have protested against the new law, calling it unconstitutional as it affects the rights of parents to make decisions for their children.