A paediatrician walks into the exam room, sits down and asks the parent a warm, open question: “So, what are you thinking about vaccines today?” It feels respectful. It invites conversation. It sounds like textbook patient-centred communication.
It may also be one of the least effective things she can say.
For years, the default strategy against vaccine hesitancy has been persuasion: correct the myths, explain the science, share stories of children harmed by preventable disease. It is intuitive and well meant. And a decade of research suggests it is often the wrong place to start.
When correcting the facts makes things worse
In 2014, a randomised study published in Pediatrics by Brendan Nyhan and colleagues tested four pro-vaccine messages on 1,759 US parents. One explained the lack of evidence linking the MMR vaccine to autism, using CDC material. Others described the dangers of measles, mumps and rubella, showed images of sick children, or told a dramatic story about an infant who nearly died of measles.
None of the messages increased parents’ intent to vaccinate a future child.
Worse, some backfired. The correction reduced belief in the vaccine-autism link, but it also reduced intention to vaccinate among the parents with the least favourable attitudes. Images of sick children increased belief in a vaccine-autism link. The dramatic narrative increased belief in serious vaccine side effects.
That doesn’t mean facts are useless. It means that information delivered to someone already resistant can be heard as pressure, and pressure tends to harden a position rather than change it.
Minds are the hard part. Behaviour is easier.
In 2017, a review in Psychological Science in the Public Interest led by Noel Brewer set out what the evidence says about increasing vaccination. The authors reported being surprised by how few randomised trials had succeeded in changing what people think and feel about vaccines, and that the few that did had only small effects on actual uptake.
What worked far better, they concluded, were interventions that build on existing intentions without trying to change them: reminders, prompts, making vaccination easier, defaults and requirements.
This is the insight most public debate misses. Many people who are under-vaccinated are not committed opponents. They intend to vaccinate, or would if it were easy. They forget, they can’t get an appointment, the clinic is closed when they are free, or they feel mildly uneasy and nobody makes the decision straightforward.
Persuasion targets a small, resistant group and often fails. Making vaccination easy targets the larger, persuadable middle and usually works.
How the doctor opens the conversation
Back to the paediatrician. In a 2013 study in Pediatrics, Douglas Opel and colleagues videotaped vaccine discussions during well-child visits. Most providers opened with a “presumptive” statement, such as “Well, we have to do some shots.” Some used a “participatory” format instead, asking parents what they wanted to do.
Parents were much more likely to resist the recommendation when the conversation opened in the participatory way. It was a small observational study, but the association was strong, if imprecise.
A randomised trial published in Pediatrics in 2017 tested this in practice. Researchers trained clinics in North Carolina to recommend HPV vaccination either with brief “announcements,” which assume the parent is ready to proceed, or with open-ended “conversations.” Six months later, HPV vaccine initiation had risen 5.4 percentage points more in announcement-trained clinics than in control clinics. Conversation training had no measurable effect.
The lesson is uncomfortable for anyone trained in shared decision-making. For a routine, recommended vaccine, treating vaccination as the normal next step works better than opening a debate. That doesn’t mean ignoring questions. It means answering them after making a clear recommendation, rather than inviting doubt before one.
The trade-off
There is a real tension here. Presumptive communication and default-based systems work partly because they reduce the sense of choice. Some clinicians and ethicists worry this edges into paternalism, and that trust may suffer if people feel steered.
That concern deserves respect. But there is also a cost to the alternative. Treating every routine vaccination as an open question signals that there is something to be uncertain about. A doctor’s neutrality can be read as doubt.
The fair balance is probably this: be clear and confident by default, and genuinely listen when a parent raises a concern. Save the long conversation for the parent who needs it, not the one who was ready to say yes.
That also protects the clinician’s time. A practice that holds a twenty-minute debate with every parent will run out of hours for the few who genuinely need one. Triage applies to conversations as much as to symptoms.
What actually changes behaviour
- Recommend clearly. Announce vaccines as routine care, then address questions.
- Remove friction. Reminders, walk-in hours, vaccination at every visit and school-based programmes reach people who already intend to vaccinate.
- Don’t lead with myth-busting. As the 2014 study showed, correcting a belief does not guarantee a change in behaviour. Focus on what to do, not what not to believe.
Why persuasion backfires: the mechanism
It is worth understanding why well-designed pro-vaccine messages can make things worse, because the explanation shapes what to do instead.
For most people, vaccine decisions are not purely about facts. They are bound up with identity, trust and a sense of control. A parent who has doubts about vaccines has often invested time in researching the question, talking to friends and forming a view. When a doctor or a public health campaign presents facts that contradict that view, the parent may experience it not as information but as a challenge to their competence as a parent.
The response to a challenge is often defensive. People look for reasons to reject the message, focus on the source’s motives, or double down on their original position. The Nyhan study captured a version of this: the correction worked on the specific fact but not on the underlying decision. Parents with the least favourable attitudes updated their belief about autism and still became less willing to vaccinate. Their concerns simply moved elsewhere.
Vivid images and frightening stories can also backfire in a subtler way. They raise the emotional temperature of a decision that clinicians want to feel routine. A message designed to frighten people about measles may also make them more anxious about everything connected to it, including the vaccine.
This is why the most effective approaches avoid confrontation. They don’t ask people to change their minds. They make vaccinating the easy default and let intentions, which are usually favourable, carry through to action.
A worked example: two clinics
Consider two clinics serving similar communities, both with modest vaccination rates.
Clinic A invests in education. It hangs posters debunking vaccine myths, trains staff to have long conversations with hesitant parents, and hands out leaflets explaining vaccine safety. Staff find these conversations tiring. Some parents leave reassured; others leave with new questions. Rates barely move.
Clinic B takes a different approach. It sends text reminders when vaccines are due. It checks vaccination status at every visit, including sick visits, and offers any overdue vaccine on the spot. Doctors are trained to recommend vaccines presumptively, “Today she’s due for her vaccines,” and to answer questions only if parents raise them. For parents with serious concerns, a nurse schedules a longer follow-up conversation. Rates rise.
Clinic B has not persuaded anyone of anything. It has made vaccination easier and more normal, and reserved persuasion for the small group who need it.
The strongest counterargument
The best objection to this approach is ethical and practical at once.
Critics argue that presumptive communication and default-based systems can shade into manipulation. Informed consent requires that patients understand what they are agreeing to and feel free to decline. If clinicians present vaccination as a foregone conclusion, parents who want to ask questions may feel unable to, and those who later discover they were “nudged” may feel their trust was abused. In an environment where distrust of institutions is already high, that could fuel the very hesitancy it seeks to reduce.
There is also a practical concern. Presumptive approaches work well with parents who were going to vaccinate anyway. With firmly hesitant parents, they may provoke resistance. Research like the Opel study found that resistant parents still resisted; the presumptive format simply made resistance less common.
These concerns are real and should shape practice. Presumptive recommendation is not the same as refusing to discuss. The approach works best when it is paired with genuine openness: a clear recommendation, followed by a real willingness to answer questions and respect a parent’s decision to take time.
But it is also worth noticing that the participatory alternative is not neutral. Opening with “What do you want to do about shots?” frames a routine, recommended intervention as an open question, which is itself a message. There is no neutral way to open the conversation. The choice is between framings, and the evidence favours the one that treats vaccination as normal.
Second-order effects
Mandates and defaults carry political risk. School entry requirements and default-based systems are among the most effective tools for raising coverage, but they can provoke backlash and become political flashpoints. Their design, including exemption rules and enforcement, matters as much as their existence.
Trust is built long before the vaccine visit. A parent’s willingness to accept a recommendation depends on their broader relationship with the health system. Continuity of care, a clinician who knows the family, and a history of being listened to all make the presumptive recommendation more acceptable.
Clinician confidence is a resource. If clinicians themselves are unsure about how to handle hesitancy, they may default to long, anxious conversations that signal doubt. Training that helps clinicians recommend confidently and handle questions calmly is a public health investment.
What this means for public messaging
None of this means public communication is pointless. Campaigns can normalise vaccination, make clear where and when vaccines are available, and support clinicians with consistent information. The mistake is expecting campaigns to convert committed sceptics, and judging them on whether they do.
A better test is whether a message makes vaccination easier to act on: a clear date, a nearby place, a reminder that arrives at the right time. Messages that do that support behaviour. Messages that mainly argue with misinformation may win the argument and lose the appointment.
What this means for decision-makers
For ministries and public health agencies, it means shifting resources from mass persuasion campaigns toward reminder systems, easier access and support for clinicians.
For health system leaders, it means building vaccination checks into every visit, making vaccines available without separate appointments, and measuring missed opportunities.
For clinicians, it means recommending clearly and confidently, answering questions honestly, and saving longer conversations for parents who need them.
For funders and researchers, it means testing interventions on actual vaccination rates, not just on attitudes or intentions, which the Brewer review found often do not translate into behaviour.
What to watch next
Watch whether health systems invest in reminder and access interventions at scale. Watch whether training in presumptive recommendation spreads beyond research settings. And watch vaccination coverage data, not survey attitudes, as the real measure of whether hesitancy is being addressed.
The takeaway
The public conversation about vaccine hesitancy is fixated on changing minds, especially the minds least likely to change. The evidence points elsewhere: make vaccination the easy, normal default, and let clinicians recommend with confidence.
Persuasion has its place. It just shouldn’t be the first tool we reach for.
What’s the single change that most improved vaccination rates in your clinic or programme? Tell us in the comments.
