California Gov. Jerry Brown signed SB 277 into law on June 30, which closes the personal-belief exemption for childhood vaccinations for children who attend a public or private school, and/or go to a day care center in California.
The only exemption now is a medical reason verified by a doctor.
Democratic Sens. Richard Pan, who is a pediatrician, of Sacramento and Ben Allen of Santa Monica wrote the bill in response to the Disneyland measles outbreak that happened in December 2014 and infected more than 100 people, notes The Associated Press.
The state has had other outbreaks in low-immunity areas.
The new law goes into effect during the 2016-17 school year, but some people are outraged, including comedian Jim Carrey.
Carrey slammed the Democratic governor on Twitter and shared his opposition to the new law, reports USA Today.
"California Gov says yes to poisoning more children with mercury and aluminum in manditory vaccines. This corporate fascist must be stopped."
The comedian also tweeted:
"I am not anti-vaccine. I am anti-thimerosal, anti-mercury. They have taken some of the mercury laden thimerosal out of vaccines. NOT ALL!"
That is technically true. Some flu vaccines do contain thimerosal to prevent contamination of the "live" vaccine, but there are options. Flu vaccination is not on the list of requirements for California students.
EverydayHealth.com notes: "Though several studies have shown that low levels of thimerosal do not cause harm, it has been removed from many vaccines for use in children. While some forms of the flu vaccine still contain thimerosal, if you prefer, you can request a single-dose unit or the nasal spray option, both of which are thimerosal-free. However, all options for the flu vaccine are safe."