HEALTHCARE · NATIONAL HEALTH AUTHORITY CASE
“How do we revive MMR vaccination coverage in lagging territories without triggering national polarization?”
Completed case for a national health authority across twelve territories with lagging coverage.
THE CONTEXT
A drop in vaccination coverage that the usual levers no longer stemmed.
A national health authority had observed, for five years, a steady erosion of MMR vaccination coverage, measles, mumps, rubella, in several territories. National coverage at 24 months, historically stable around 91%, had fallen to an average of 84%. In a dozen more fragile territories, it had dropped below 76%, under the epidemiological threshold of herd immunity. Three of these territories had experienced limited but visible measles episodes in the previous 18 months, with cases requiring hospitalization. The directorate general for health estimated that a prolonged return of the disease was probable within two years if coverage kept receding.
The usual levers had been mobilized without significant effect. Two national public communication campaigns had been launched in three years, with substantial budgets and careful execution. Impact studies showed high message recognition but a near-zero shift in vaccination intent. Family doctors received technical updates and support kits, but actual use of these kits in consultations remained low according to field surveys. Local authorities, prefectures, regional health agencies, organized territorial catch-up programs that captured only a limited share of uncovered children.
The health authority's steering committee had to present the minister with a new structured plan, with a budget of €42 million over three years. Three structuring options were on the table: a firm national campaign recalling the vaccination obligation, a targeted territorial plan for the twelve lagging departments with differentiated approaches, or an indirect approach resting on equipping family doctors as the main messengers. Each option had its internal supporters and opponents. The political risk was high: a badly calibrated national statement could reawaken the organized anti-vaccine movements waiting for an occasion to remobilize, with lasting consequences for the health authority's legitimacy.
That is when the steering committee mobilized our system. The brief was to test each of the three options on the real populations of the lagging territories, with particular attention to possible polarization movements at the national level. The request included a 24-month projection of coverage in each scenario, and a sensitivity analysis on communication parameters: wording, channel, messenger, territorial sequencing. The result was expected within five weeks, ahead of the presentation to the minister.
THE INQUIRY
Five insights that steered the new plan.
The rejection is not ideological, it is experiential.
Against the dominant narrative that explains vaccine hesitancy by the influence of anti-vaccine movements, our system identified that only 8% of hesitant parents are convinced anti-vaxxers. The remaining 74% have a different profile: they have lived through one or more degraded care experiences in the previous five years: a missed appointment, listening judged insufficient, contradictory information between professionals, a minor complication poorly explained. These experiences, with no direct link to vaccination, crystallize at the moment of the vaccination decision into a general hesitancy toward the health system. The message must answer that experience, not the ideological debate.
The firm national campaign makes things worse in four territories out of twelve.
Our system projected the effect of a firm national campaign on the twelve lagging territories individually. In eight, the effect is weakly positive: coverage rises 2 to 4 points over 24 months. In four, the effect is clearly negative: coverage falls a further 3 to 7 points. These four territories share one trait: they were already politically polarized on other subjects, with structural distrust of Paris and central authorities. A firm national statement triggers a Streisand effect there: the call to order becomes a trigger for opposition. A uniform national plan is counter-productive in these territories.
Family doctors are the only cross-cutting channel.
Our system tested the favorable listening of the 18 hesitancy typologies across eight possible messengers: national health authorities, regional authorities, family doctors, pediatricians, committed celebrities, expert scientists, other parents, family associations. Only one messenger obtains favorable listening across all 18 typologies: the family doctor. Every other messenger is rejected by at least 3 typologies. A strategy that systematically equips family doctors, with dialogue kits calibrated by hesitancy typology, specifically remunerated catch-up consultations, an automated reminder system, obtains +23 points of coverage in 18 months in the targeted territories.
The dialogue kit must be differentiated by typology.
Our system tested the same catch-up consultation with five variants of the doctor's dialogue kit: generic, safety-oriented, care-oriented, care-experience-oriented, generational-transmission-oriented. Results differ strongly by parent typology. The care-experience kit obtains +34% conversion among parents who lived through a care incident. The generational-transmission kit obtains +28% conversion among young first-time parents. No single kit dominates across all typologies. Segmenting the kit through a three-question questionnaire ahead of the consultation is the most effective lever.
National visibility of territorial catch-ups is a trap.
Our system tested national media coverage of the fastest territories' catch-up successes. Counter-intuitively, that coverage degrades performance in the remaining territories: it is read as proof that the authorities are instrumentalizing public health. Communication that stays discreet, professional and local, without a national media narrative of success, obtains faster progress in the initially most fragile territories. National media silence is a strategic choice, not a lack of communication.
THE METHOD
How we built the inquiry.
Our system rebuilt a synthetic population of 2.4 million parents of children aged 12 to 24 months, distributed proportionally across the twelve lagging territories. The population was calibrated on public data from INSEE, Santé publique France, and the annually published vaccination coverage surveys. No personal records entered the system. The structuring into 18 vaccine-hesitancy typologies was built by crossing six dimensions, personal care experience, level of trust in institutions, scientific cultural capital, family and social environment, media exposure, territorial political context, then validated by cross-reference with the available public qualitative studies on vaccine hesitancy.
On this base population, our system individually interviewed 4,800 synthetic parents across the 18 typologies. Each parent was exposed to the 34 tested communication formats, television spots, posters, invitation letters, medical consultation dialogues, short social media content, personalized SMS messages, in randomized order. The dynamic agents followed up with each parent based on the first answers, with an average of eight follow-up questions per person, surfacing deep motivations the initial questions did not reach. This interview phase compressed the equivalent of six weeks of human work into under five minutes of computation.
Our system then modeled the vaccination coverage trajectory over 24 months in each scenario, territory by territory. The modeling accounted for several parameters: local opinion dynamics, contagion effects between close parents, the effect of national media announcements, the seasonality of pediatric consultations, the responsiveness of catch-up programs. This projection produced 12 distinct trajectories per scenario, 96 in total for the eight finalist scenarios retained by the committee. It is this combination, individual listening + territorial trajectory + national modeling, that identified the family doctors + differentiated kits strategy as dominant in 11 territories out of 12.
THE DEPLOYMENT
What was decided, what happened.
The steering committee retained the dominant scenario identified by our system: systematic equipping of family doctors with dialogue kits differentiated by typology, a specifically remunerated catch-up consultation, an automated reminder system, and national media discretion on territorial progress. The plan was presented to the minister three weeks after the inquiry's delivery and validated without structural modification. The €42 million budget was reallocated: a significant reduction in national public communication, a strong increase for family doctors and territorial infrastructure, and a dedicated envelope for the pre-consultation segmentation questionnaire.
Deployment began four months after the minister's decision. The dialogue kits were co-designed with the representatives of general practice: the French College of General Medicine, unions of private-practice doctors, pediatric learned societies. This co-design, not initially planned, was identified as critical by our system in the simulations: a kit imposed on doctors without co-design obtains an actual usage rate below 30%. The co-designed kit was tested in three pilot territories for six months before generalization. The pilot territories' results validated the initial projections, with minor adjustments to the wording for two typologies.
At 18 months into full deployment, the indicators are in line with or above our system's projections. Average vaccination coverage across the twelve lagging territories rose from 76% to 87%: above the 85% projection. In the four most polarized territories, where the alternative firm national campaign scenario would, per our simulations, have worsened the situation, coverage rose 8 to 12 points. No national polarization movement was detected by the media monitoring systems. Family doctors widely adopted the kits, 78% of them use them at least monthly, with professional satisfaction measured at 71%.
- VACCINATION COVERAGE AT 18 MONTHS
- 76% → 87%above the projected 85%
- NATIONAL POLARIZATION RISK
- 67% → 0%projected vs observed
- PROGRESS IN POLARIZED TERRITORIES
- +8 to +12 ptsabove projection
- KIT ADOPTION BY FAMILY DOCTORS
- 78%vs projected 65%
- DOCTORS' PROFESSIONAL SATISFACTION
- 71%at 18 months
- SIMULATION COST VS MISTARGETED CAMPAIGN AVOIDED
- 1 : 34
THE LESSONS
Three principles transposable to other sensitive decisions.
Territorial granularity changes the nature of the decision.
Our system showed that the same measure, the firm national campaign, could be positive in eight territories and negative in four. This heterogeneity, invisible to aggregate national indicators, is structural in almost every public policy decision. Classic studies measure averages that hide decisive territorial variances. Simulation on synthetic populations makes those variances visible before the decision is committed.
The messenger's legitimacy matters as much as the message.
In this case, the same message obtains strongly differentiated results depending on whether it is carried by a national authority, a regional agency, a family doctor or a pediatrician. It is not the content that varies: it is the listening it receives. This dimension is particularly critical in sectors where the relationship of trust conditions adherence: healthcare, education, social protection, security. Identifying the legitimate messenger for each audience typology is a prerequisite to any public statement.
Media discretion can be an active strategy.
Counter-intuitively, this case showed that a national media narrative of territorial successes degraded performance in the remaining territories. The principle applies in several contexts: organizational transformations with progressive rollout, territorialized public policies, social experiments to be generalized. Institutional communication has long favored maximum visibility of progress to create momentum. This case is a reminder that in some configurations, active discretion is more effective than forced visibility.
GET STARTED
Preparing a public health decision of this kind?
Structuring health policy decisions, screening campaigns, prevention plans, reforms of access to care, management of exceptional events, share common mechanics with this case. Differentiated populations, resistances that are experiential rather than ideological, the decisive weight of channel and messenger, strong territorial sensitivity, a national polarization risk to watch. Every decision is singular, but the analytical levers are transposable.
The dynamic agents scope with you the parameters of a simulation adapted to your situation, ahead of the decision. From initial brief to first deliverable, allow 20 to 30 minutes, depending on the case's complexity and the breadth of the populations to model.