Jessica Biel has denied she is an anti-vaxxer in a lengthy post on Instagram.
The post follows Biel's meeting with California anti-vaccination advocate Robert F. Kennedy Jr on Thursday to discuss a state bill which would limit medical exemption from vaccinations.
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Kennedy is the chairman of the Children's Health Defense, which strongly opposes both vaccinations, and the bill which would limit medical exemptions. He posted a picture of himself and Biel on Instagram, thanking her for "a busy and productive day at the California State House."
The actress received backlash for meeting with Kennedy, with comments on his Instagram post calling her an "idiot," saying she was "dumb as a rock," and accusing her of "fearmongering."
On Friday she posted on her own Instagram to address the concerns.
"I am not against vaccinations," she wrote.
"I support children getting vaccinations and I also support families having the right to make educated medical decisions for their children alongside their physicians,"
She explained her concern regarding the Bill, saying it would affect children who medically cannot receive vaccinations.
"That's why I spoke to legislators and argued against this bill. Not because I don't believe in vaccinations, but because I believe in giving doctors and the families they treat the ability to decide what's best for their patients," she said.
Her controversial stance comes amid California's largest measles outbreak since the disease was eradicated in 2000.
More than 750 people have been diagnosed across America, 44 of which have been in California, reports the Los Angeles Times.