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Three women become choked up as they deliver news in a video posted to social media. “We did it, everybody,” says Leslie Manookian, the woman in the middle. She is a driving force in a campaign that has chipped away at the foundations of modern public health in Idaho. The group had just gotten lawmakers to pass what she called the first true “medical freedom” bill in the nation. “It’s literally landmark,” Manookian said. “It is changing everything.”

With Manookian in the video are two of her allies, the leaders of Health Freedom Idaho. It was April 4, hours after the governor signed the Idaho Medical Freedom Act into law.

The act makes it illegal for state and local governments, private businesses, employers, schools and daycares to require anyone to take a vaccine or receive any other “medical intervention.”

Whether the law will actually alter day-to-day life in Idaho is an open question, because Idaho already made it easy to get around the few existing vaccination requirements.

But it could have a significant effect in other states, where rules aren’t already so relaxed. And it comes at a time when diseases once eradicated from the U.S. through vaccination are making a resurgence.

The law runs against one of the hallmarks of modern public health: that a person’s full participation in society depends on their willingness to follow certain rules. (Want to send your child to public school? They’ll need a measles vaccine. Want to work in a retirement community during flu season? You might have to wear a mask.)

The new Idaho law flips that on its head. It not only removes the obligation to follow such rules, it makes the rules themselves illegal.

The new law sets Idaho apart from even conservative-leaning South Carolina, where two schools recently quarantined more than 150 unvaccinated children after measles arrived.

A person can spread measles for four days before symptoms appear. During the South Carolina schools’ quarantine, five students began to show symptoms, but the quarantine kept them from spreading it, the health department said this month.

That precaution would now be illegal in Idaho.

Idaho’s law caught the attention of people who share Manookian’s belief that — contrary to hundreds of years of public health evidence and rigorous regulation in the U.S. — vaccines are worse than the diseases they prevent.

It also caught the attention of people like Jennifer Herricks, a pro-vaccine advocate in Louisiana and advocacy director for American Families for Vaccines.

Herricks and her counterparts in other states say that vaccine requirements have “done so much good for our kids and for our communities.”

An analysis published last year by the U.S. Centers for Disease Control and Prevention found that routine childhood vaccines prevented more than 1.1 million deaths and 32 million hospitalizations in the U.S. over three decades, saving $540 billion in direct costs and saving society about $2.7 trillion. The analysis was limited; it didn’t account for the lives and money saved by vaccines for flu or RSV, which kill and hospitalize babies and children each year.

Idaho’s move was “pretty concerning,” Herricks said, “especially seeing the direction that everything is headed at the federal government.”

The law is the culmination of a decade of anti-vaccine activism that got a boost from the pandemic.

It’s rooted in a belief system that distrusts institutions — government health agencies, vaccine makers, medical societies and others — on the premise that those institutions seek only money and control.

Manookian said in an interview that she believes one person should never be told to risk their health in “the theoretical” service........

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