This week, the CDC changed the language on its website to falsely suggest that vaccines may cause autism,

even though there's no scientific evidence to prove such a link.

Health and Human Services Secretary Robert F. Kennedy Jr. said he personally directed that reversal.

It's just the latest in a series of changes to federal vaccine guidance and policy since Kennedy

took office. In anticipation of more changes to come, a number of Democratic-led states

have taken steps of their own. They're trying to protect access to vaccines and to push back

on misinformation. William Brangham reports from one of those states, Colorado.

Good question.

At every child pediatrics just outside Denver,

Natalie and Melissa Barba brave their way through flu and COVID shots.

It's going to be okay, I promise. I promise.

Relax.

Their mom, Sandra, has been vaccinating her kids here for years.

So when she hears misinformation swirling around vaccines, she knows where to turn.

I just come to my doctor and talk to her about it.

Like, do you feel this is true?

And then she just tells me like a little bit of the statistics.

And I feel more comfortable and I trust her.

So over time, that difference can get worse.

Her pediatrician is Dr. Sophia Maharena.

This practice serves lots of patients who are uninsured or on Medicaid.

Recently, she's noticed a shift in some of her patient's views about vaccines. I had a patient come in for her six-month appointment, I think, and the mom decided

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