Faire un titrage MMR (ROR) ou un rappel à l'âge adulte pendant la résurgence de la rougeole de 2025, ou s'en passer ?
Si vous agissez
Faire un dosage ou un rappel ROR à l'âge adulte
0,001%
Si vous n’agissez pas
Ne rien faire et se fier à l'immunité acquise dans l'enfance
6,0%
Pourcentage de personnes qui regrettent ensuite chaque choix. Les barres et le registre complet s’affichent ci-dessous.
Santé
Dernière révision 2026-06-13
Qualité des preuves 4.1/5
Score d’évaluation en huit dimensions selon la
grille de qualité
. Chaque dimension notée de 1 à 5.
D1 Vérification des sources
5/5
D2 Autorité et indépendance des sources
5/5
D3 Précision du taux de regret
3/5
D4 Comparabilité des sources
3/5
D5 Motif de Gilovich
4/5
D6 Qualité de la prose
4/5
D7 Complétude des réserves
4/5
D8 Qualité de l’échantillon
5/5
Moyenne4.1/5
Données de substitution — aucune enquête directe sur les regrets n'existe pour cette décision. Les taux sont dérivés des scores de satisfaction et des obstacles d'accès plutôt que de questions portant directement sur les regrets. Voir les mises en garde ci-dessous.
Regret d'action
Faire un dosage ou un rappel ROR à l'âge adulte
0,001%
<0.001% — proxy: a serious adverse event (anaphylaxis) is the only material downside; redundancy in an already-immune adult is not a regret-worthy outcome
US adults who seek an MMR titer or a precautionary MMR dose (1963-67 killed-vaccine cohort, healthcare personnel, immunocompromised contacts) during the 2025 resurgence
Per dose administered
Regret d'inaction
Ne rien faire et se fier à l'immunité acquise dans l'enfance
6,0%
~6% — proxy: share of a US healthcare-worker serosurvey lacking a measles immunity marker (seronegative + equivocal); an upper bound on who carries an immunity gap, not a measured regret rate
US adults in the named higher-risk cohorts (1963-67 killed-vaccine recipients, healthcare personnel, immunocompromised) who skip serologic check or revaccination during the 2025 resurgence
Cross-sectional immunity gap during the 2025 resurgence
% regrettent ce choix
Faire un dosage ou un rappel ROR à l'âge adulteNe rien faire et se fier à l'immunité acquise dans l'enfance
0,001%6,0%
inaction dominates — L'inaction domine — la plupart regrettent de ne pas avoir agi.
Décisions associées
Décisions sémantiquement similaires — même terrain, compromis différents.
Omettre ou refuser les vaccins recommandés chez l'adulte (pas de vaccin antigrippal annuel, pas de rappels COVID, pas de vaccin contre le zona à 50 ans ou plus, pas de rattrapage HPV)Suivre le calendrier vaccinal adulte recommandé (grippe annuelle, rappels COVID-19, zona à 50 ans ou plus, rattrapage HPV jusqu'à 45 ans)
Renoncer ou refuser les vaccins de voyage recommandés (pas d'hép A ni de typhoïde avant l'Asie du Sud/Sud-Est, pas de fièvre jaune avant l'Afrique ou l'Amérique du Sud endémique, pas d'encéphalite japonaise pour l'Asie rurale)Recevoir les vaccins de voyage recommandés selon les recommandations CDC/OMS par destination avant le départ (hép A et typhoïde pour les destinations non occidentales, fièvre jaune pour les zones endémiques, JE pour les séjours ruraux en Asie de ≥1 mois)
Omettre, retarder ou refuser sélectivement les vaccins de l'enfance (pas de ROR, pas de DTCa, calendrier alternatif ou refus complet)Suivre le calendrier vaccinal pédiatrique recommandé par les CDC/AAP (ROR, DTCa, polio, Hib, hépatite B, varicelle, etc., dans les délais)
Prendre un schéma de chimioprophylaxie antipaludique recommandé par le CDC/OMS (atovaquone-proguanil/Malarone, doxycycline ou méfloquine) avant, pendant et après un voyage vers une destination d'endémie palustreRenoncer à la chimioprophylaxie antipaludique et se reposer uniquement sur la prévention des piqûres de moustiques (DEET, vêtements traités à la perméthrine, moustiquaires, moustiquaires de lit) pour un voyage en zone d'endémie palustre
Reporter ou annuler le voyage prévu en raison d'une maladie aiguë, d'une chirurgie récente, d'une grossesse avec complications, d'une immunodépression ou d'une épidémie active à destinationVoyager comme prévu malgré une maladie aiguë, une chirurgie récente, une complication de grossesse, une immunodépression pendant une épidémie à destination ou tout autre avertissement de médecine aérospatiale
No survey asks adults whether they regret getting, or skipping, a measles booster during the 2025 resurgence. The few documented post-outbreak interviews run the other way: the parents of the Texas child who died in 2025 told reporters they stood by their decision not to vaccinate. So this pair is a proxy. The action side is anchored on the probability of a serious adverse event from the shot itself, and the inaction side on the share of the relevant cohort that carries no measurable measles immunity. Neither number is a regret rate; both are stand-ins, and the gap between them is wide.
The action downside is small and well-characterized. Anaphylaxis after an MMR-containing vaccine was reported to VAERS at 0.6 per million doses over 1990 to 2016, and the CDC’s Vaccine Information Statement describes a serious reaction as a “very remote chance.” The common outcomes — a sore arm, a brief fever, a mild rash — are not the kind of thing people later regret. The subtler point is that for the large majority of adults who turn out to have been immune already, the booster was redundant rather than harmful, and a redundant-but-protective dose tends to read as reassurance, not as a mistake. That is why the action proxy sits near the floor: the only genuinely regret-worthy action outcome is the rare serious event, on the order of one in a hundred thousand or rarer.
The inaction side is where the cohorts in the question matter. A US healthcare-worker serosurvey found 4% seronegative and 2% equivocal for measles IgG — a roughly 6% immunity gap — and a 2025 meta-analysis of 23,236 vaccinated people pooled seropositivity at 87.8%, falling to 84.3% among single-dose recipients. The 1963-67 killed-vaccine cohort is a separate, smaller group that ACIP explicitly tells to revaccinate, because the inactivated product conferred little durable protection. The catch is that an immunity gap is not the same as realized regret: with 2,288 confirmed US cases in 2025 against a population of roughly 340 million, the national attack rate stayed near 0.0007%, so most seronegative adults were never exposed at all. What gives the gap its weight is the severity tail — 11% of 2025 cases were hospitalized and there were deaths — so the rare intersection of “no immunity” and “exposed” is consequential. The honest reading: skipping leaves a measurable hole in protection for a minority of these cohorts, getting the dose closes it at trivial cost, and the realized-regret asymmetry favors acting even though almost no one in either group will ever face the outcome that would make the choice matter.
Sources : action
Registre des sources
Chaque chiffre ci-dessous correspond à ce que la source a rapporté, avec la citation textuelle sur laquelle nous nous sommes appuyés et la méthode de calcul. Cliquez sur un lien pour vérifier directement.
1/2 sources vérifiées de manière indépendante, mot pour mot, par rapport à la source citée
[1]Journal of Allergy and Clinical Immunology / NCBI PMC — Anaphylaxis after vaccination reported to the Vaccine Adverse Event Reporting System, 1990–2016
Vérifié
Revue par les pairs
MMR-containing vaccine anaphylaxis reporting rate of 0.6 per 1 million doses distributed (overall vaccine rate 1.3 per million).
Extrait
“The estimated rate of anaphylaxis reported to VAERS during 1990 to 2016 after MMR was 0.6 per 1 million doses distributed.”
Données source de
2019-01-01
Consulté le
2026-06-13
Vérification
Extrait récupéré et confirmé de manière indépendante, mot pour mot, par rapport à la source citée lors de notre audit de vérification.
Calcul
Anaphylaxis is the canonical serious adverse event of MMR. 0.6 per 1,000,000 doses = 6e-7. The action regret_rate is set conservatively above that floor (1e-5) to absorb other rare serious events (febrile seizure, transient thrombocytopenia) the VIS lists. The dominant 'downside' of acting for an already-immune adult is a redundant dose, which yields peace of mind rather than regret, so it is not counted as regret. This is the matched-severity proxy: action's regret-worthy outcome is a serious AE, not 'the shot turned out unnecessary'.
[2]U.S. Centers for Disease Control and Prevention — MMR Vaccine Information Statement (VIS)
Rapport gouvernemental
Serious adverse events from MMR are characterized as a very remote chance; common effects are minor (sore arm, fever, mild rash).
Extrait
“As with any medicine, there is a very remote chance of a vaccine causing a severe allergic reaction, other serious injury, or death.”
Données source de
2025-01-31
Consulté le
2026-06-13
Calcul
Qualitative confirmation that the action side's serious downside is 'very remote.' Establishes that the regret-worthy outcome of acting is rare and severe (an AE), distinct from the common, non-regret outcome of a redundant-but-protective dose. No numeric rate on this page; the numeric anchor is PMC6580415.
Sources : inaction
Registre des sources
Chaque chiffre ci-dessous correspond à ce que la source a rapporté, avec la citation textuelle sur laquelle nous nous sommes appuyés et la méthode de calcul. Cliquez sur un lien pour vérifier directement.
3/6 sources vérifiées de manière indépendante, mot pour mot, par rapport à la source citée
[1]Infection Control and Hospital Epidemiology (PubMed) — Measles immunity in a population of healthcare workers
Vérifié
Revue par les pairs
Among 2,473 US healthcare workers tested for anti-measles IgG, 4% were seronegative and 2% equivocal — a ~6% immunity gap.
Extrait
“Ninety-three workers (4%) were seronegative, and 56 (2%) were equivocal.”
Données source de
1994-01-01
Consulté le
2026-06-13
Vérification
Extrait récupéré et confirmé de manière indépendante, mot pour mot, par rapport à la source citée lors de notre audit de vérification.
Calcul
Population-matched anchor: US healthcare workers, one of the named higher-risk cohorts. Seronegative (4%) + equivocal (2%) = 6% lacking a measles immunity marker → inaction proxy 0.06. This is an immunity-gap upper bound, not a realized-regret rate: most seronegative people are never exposed (2025 national attack rate ~ 2,288 / ~340M ~ 0.0007%). The proxy measures who is even eligible for potential regret if exposed.
[2]eClinicalMedicine (The Lancet Discovery Science) — Measles seropositivity in previously vaccinated individuals: a systematic review and meta-analysis
Revue par les pairs
Pooled seropositivity among vaccinated individuals was 87.8% (so ~12.2% seronegative); single-dose recipients 84.3% seropositive (~15.7% seronegative), across 23,236 individuals from 10 countries.
Extrait
“Pooled seropositivity was 87·8% (95% CI, 83·9%–91·2%) across 23,236 vaccinated individuals”
Données source de
2025-01-01
Consulté le
2026-06-13
Calcul
Current (2025) pooled anchor confirming waning: ~12% of vaccinated adults are below seropositivity thresholds, rising to ~16% for single-dose recipients. Verified verbatim via Playwright (Lancet 403s WebFetch). Used to frame the spread; the 6% HCW figure is kept as the population-matched headline rather than the 12-16% pooled (mixed-country, assay-threshold) number to avoid overstating realized susceptibility.
[3]U.S. Centers for Disease Control and Prevention — Measles Vaccination for Specific Groups
Rapport gouvernemental
ACIP recommends revaccinating recipients of killed/inactivated or unknown-type measles vaccine from 1963-1967; healthcare personnel without presumptive immunity need 2 doses.
Extrait
“The ACIP recommends re-vaccinating anyone who received measles vaccine of unknown type, inactivated measles vaccine, or further attenuated measles vaccine accompanied by immunoglobulin or high-titer measles immune globulin (no longer available in the United States) during these years with 1 or 2 doses.”
Données source de
2024-07-15
Consulté le
2026-06-13
Calcul
Establishes that the 1963-67 killed-vaccine cohort is functionally unprotected per ACIP and explicitly advised to revaccinate — the qualitative basis for why skipping carries downside for this cohort. This cohort is <5% of adults and overlaps the pre-1957 presumed-immune group, so it informs but does not set the numeric anchor.
[4]CDC MMWR / NCBI PMC — Measles Update — United States, January 1–April 17, 2025
Vérifié
Rapport gouvernemental
Of 800 confirmed 2025 cases through April 17, 96% were unvaccinated or unknown status, 11% hospitalized, 3 deaths.
Extrait
“Overall, 771 (96%) patients have been unvaccinated or had unknown vaccination status”
Données source de
2025-04-24
Consulté le
2026-06-13
Vérification
Extrait récupéré et confirmé de manière indépendante, mot pour mot, par rapport à la source citée lors de notre audit de vérification.
Calcul
Establishes the severity tail that makes the immunity gap consequential: 11% of measles cases hospitalized, 3 deaths in the period, 96% of cases in the unvaccinated/unknown. The realized harm to someone in the immunity gap who is exposed is severe; this is what gives the inaction proxy its weight.
[5]U.S. Centers for Disease Control and Prevention — Measles Cases and Outbreaks — 2025 Data Summary
Vérifié
Rapport gouvernemental
Full-year 2025: 2,288 confirmed US measles cases — the largest annual count since 1992.
Extrait
“For the full year of 2025, a total of 2,288 confirmed* measles cases were reported in the United States.”
Données source de
2026-06-12
Consulté le
2026-06-13
Vérification
Extrait récupéré et confirmé de manière indépendante, mot pour mot, par rapport à la source citée lors de notre audit de vérification.
Calcul
Sets the exposure backdrop: 2,288 cases / ~340M US population ~ 0.0007% national attack rate. This is why the 6% immunity-gap proxy is explicitly an upper bound on potential regret, not realized regret — exposure remained geographically concentrated and rare nationally even in the worst year since 1992.
[6]The Texas Tribune — Texas measles victim's parents stand by decision to not vaccinate
Article de presse
After their unvaccinated 6-year-old daughter died of measles in Gaines County, Texas in February 2025, the parents said in a recorded statement that the death did not change their opposition to the MMR vaccine.
Extrait
“"We would absolutely not take the MMR," the mother said, adding that her stance on vaccination has not changed after her daughter's death.”
Données source de
2025-03-20
Consulté le
2026-07-03
Calcul
Illustrative real-world counterpoint, not a numeric input to the 0.06 inaction proxy: a parent's decision about a child's routine MMR dose amid a measles death is a different population and decision from the adult titer/booster question this entry covers, and one family's account is not a survey. Cited to support the body-text point that documented post-outbreak reactions do not uniformly run toward regretting non-vaccination.
Réserves
proxy_only: there is no direct "regret getting/skipping an MMR booster" survey; both rates are stand-ins. The inaction rate (6%) is the share of a US healthcare-worker serosurvey lacking an immunity marker (seronegative + equivocal), i.e. an upper bound on who is even eligible for regret, NOT a measured regret rate — most seronegative people are never exposed (2025 national attack rate ~0.0007%). The susceptibility spread is wide and assay-dependent: 6% (US HCW IgG), 12.2% (2025 pooled meta-analysis), up to ~37.6% in one Olmsted County, MN commercial-assay study whose high figure is largely a below-titer-threshold artifact (titer below cutoff does not equal susceptible, because anamnestic memory-B-cell immunity is not captured) and is therefore excluded from the anchor. The 1963-67 killed-vaccine cohort is <5% of adults and overlaps the pre-1957 presumed-immune group, so it is a qualitative ACIP-revaccinate flag rather than the numeric anchor. The action anaphylaxis figure (0.6/million) is a passive-surveillance VAERS reporting rate, not a measured incidence. The meta-analysis pools 10 countries, not US-only. CDC publishes immunity and case data, not regret; this entry should not be read as advice to get or skip a dose.
