The Erosion of Public Health Trust in America

In the spring of 2025, three out of four Americans said they trusted the CDC’s health recommendations. A year later, that number is 50%. No pandemic, no scandal that made the front page for a week and vanished — just a slow bleed that turned into a hemorrhage, and nobody in public health seems to know how to stop it.

The Collapse Happened Fast, Then Faster

For most of the pandemic recovery years, trust in the CDC held remarkably steady in the mid-70s, according to polling from KFF and the de Beaumont Foundation. That was the calm before something. Between 2025 and 2026, trust in CDC health recommendations cratered from 77% to 50% — and the partisan split behind that number is the real story. Democrats went from 92% trust to 34%. Independents fell from 77% to 47%. Republicans, meanwhile, ticked up slightly, from 63% to 67%.

That is not a gradual erosion of confidence in an institution. That is one half of the country switching its opinion of the CDC almost overnight, in response to a change in who runs it. Trust in the FDA slid too, from 60% to 52% over roughly the same window. State health agencies dropped from 80% to 66% trust; local agencies, generally the most trusted tier, fell from 82% to 70%.

“Trust used to be the thing institutions earned once and spent slowly. Now it resets every election cycle, and the balance never gets back to where it started.”

The Needle Follows the Sentiment

Trust polling is an abstraction until you look at what parents are actually doing with their kids. During the 2024–25 school year, the share of kindergartners with an exemption from one or more required vaccines rose to 3.6%, up from 3.3% the year before — another record, following the record set the year before that. Nearly all of these are non-medical exemptions: religious or personal-belief opt-outs, not doctor-recommended waivers for kids with real contraindications.

Coverage for MMR — measles, mumps, rubella — slipped to 92.5% nationally, the fifth consecutive year the country has missed the 95% threshold public health officials consider necessary for herd immunity. Seventeen states now report exemption rates above 5%. That gap between “herd immunity” and where America actually sits isn’t academic: it’s roughly 286,000 kindergartners entering school this year without full protection against diseases this country eliminated a generation ago. The country also just logged its highest measles case count since 1992.

Distrust Doesn’t Stay in Its Lane

What makes this particular decay signal dangerous is that it doesn’t confine itself to vaccines. Once people stop believing the agency that tells them what to do during a measles outbreak, they tend to stop believing it about food safety, water quality, opioid guidance, workplace exposure limits — the whole quiet machinery of public health that only gets noticed when it fails. Distrust is not selective. It generalizes.

And once it generalizes, it becomes self-reinforcing. Lower vaccination rates mean more outbreaks. More outbreaks, covered by a media environment that treats every CDC statement as a political position rather than a scientific one, mean more opportunities for trust to fall further. There’s no obvious floor to this. The last time American vaccination confidence was this fractured, entire diseases came roaring back into rotation.

The Index tracks this because public health trust is one of the few metrics that translates directly into bodies — measles cases, whooping cough clusters, outbreaks that used to be historical footnotes. When half the country stops believing the people whose job is to keep them alive, that’s not a communications problem. It’s a social health indicator flashing red.