I have spent my career sticking needles into small, furious thighs. Measles, polio, whooping cough, Hib, pneumococcus: we have shots for all of them, and they work beautifully.
But after years in the exam room, I have to admit there is one epidemic I can’t touch. No shot, no nasal mist. It spreads by Facebook comment, travels at the speed of a forwarded group text, and has an R-naught somewhere north of measles. There is no vaccine for stupid. And, sadly, none for crazy either.
Meet the Pathogen: Confirmation Bias
Before anyone sends an angry email (you will anyway, and that’s sort of my point), let me be clear: I’m not talking about intelligence. The real disease has a fancier name: confirmation bias. Confirmation bias is the brain’s habit of collecting evidence the way a toddler collects Halloween candy. Anything that agrees with what we already believe goes straight in the bag. Anything that doesn’t gets tossed over the shoulder like a box of raisins.
Here’s how it presents clinically:You see a study that supports your view. “Finally, real science.” You see ten studies that contradict your view. “Follow the money.” Your cousin’s chiropractor’s neighbor had a bad experience. “Well, that settles it.”
Notice the symptoms. The patient is not ignoring evidence. The patient is curating it, like a museum that only displays paintings of itself.
The Natural History of a Modern Conversation
In medicine we love describing how a disease progresses over time. So here is the natural history of every conversation in 2026:
Stage 1: Someone states an opinion at Thanksgiving.
Stage 2: Someone else gently offers a different perspective, possibly with facts.
Stage 3: The first person hears none of the facts and only the tone, which they interpret as an attack on their family, their freedom, and their favorite podcast host.
Stage 4: Both parties retreat to their phones to find articles proving they were right all along. Both succeed, because the internet has an article proving literally everything, including that birds aren’t real.
Stage 5: Pie is served in silence. Nobody has changed their mind. Everyone is now more certain than when they started.
The prognosis is poor. There is no Stage 6 where someone says, “You know, I hadn’t thought of it that way.” Stage 6 is rarer than a unicorn sighting.
Why Facts Don’t Work (Spoiler: You Have a Brain)
Here’s the uncomfortable part. Our brains weren’t built to be right. They were built to keep us alive and keep us in the tribe. Ten thousand years ago, disagreeing with your group about which berries were poisonous could get you kicked out of the cave, and being kicked out of the cave was a great way to become a saber-toothed tiger’s lunch. So when a belief becomes part of who we are (“I’m the kind of person who does my own research”), challenging it doesn’t feel like a debate. It feels like a threat. And people under threat do not sit back, stroke their chins, and consider your peer-reviewed citation. They dig in. They double down. They buy a shovel and go full mineshaft.
The cruelest twist? The more invested someone is, the harder this gets. And the people most confident in their expertise are often the ones who just finished watching a 14 minute video with dramatic music. Nothing says “I’ve mastered immunology” like a YouTube thumbnail with a red arrow and a shocked face.
If Only There Were a Shot
Imagine it. You walk into my office, I swab a little alcohol on your arm, and I give you a single dose of the MMR: Modest, Mindful, Reasonable. Side effects may include: Saying “Huh, interesting” instead of “WAKE UP, SHEEPLE.” Reading past the headline. Checking whether the “doctor” in the viral video is actually a doctor, or just a guy named Doctor. Admitting you were wrong without needing a weekend to recover.
We’d need boosters, of course. Probably every election cycle. Sadly, the FDA has not approved this product, and I can already hear the comments: “I’m not putting THAT in my body.” Which, honestly, would be the most on-brand reaction possible.
The Closest Thing We Have
Here is where I drop the sarcasm for about thirty seconds, because there is actually something resembling a shot. Psychologists have studied an idea literally called “inoculation” or “prebunking.” It works a lot like a vaccine: you expose people to a weakened dose of a manipulation technique before they meet the real thing. Show someone how fake experts, cherry picked data, and fear based headlines work, and they get better at spotting them later. It wears off, so it needs boosters. Sound familiar?
A few other things that actually help in real life: Ask questions instead of firing facts. “What would change your mind?” is more powerful than a stack of PubMed links. If the answer is “nothing,” congratulations, you’ve found the diagnosis. Lead with what you agree on. Almost every parent I see wants the same thing: a healthy kid. Start there. Lower the temperature. Nobody has ever been yelled into open mindedness.
Let people save face. Changing your mind is hard. Changing it in public, in front of your brother-in-law, is nearly impossible. Check yourself. This is the painful one. Confirmation bias doesn’t only infect the other guy. If you can’t remember the last time you changed your mind about anything important, you might want to take your own temperature.
The Bottom Line
I can protect your child from measles with two doses. I can protect them from whooping cough, tetanus, and a long list of diseases that used to fill pediatric wards and cemeteries. That’s the miracle of modern medicine. What I can’t do is protect anyone from a closed mind. That one takes something no drug company can make: curiosity, humility, and the willingness to say three of the hardest words in the English language.
No, not “I love you.” “I was wrong.” Until somebody figures out how to put that in a syringe, we’ll just have to keep talking, keep listening, and keep hoping that somewhere, someday, at some Thanksgiving table, someone finally reaches Stage 6. I’ll bring the pie.
This article is for general educational purposes only and is not a substitute for individualized medical advice. Always consult your child’s own healthcare provider for recommendations tailored to your specific situation.