Paeds · preventive-and-community-paediatrics
Catch-up immunisation and uncertain vaccination history
Also known as Catch-up vaccination · Delayed immunisation schedule · Incomplete vaccination history · Undocumented vaccine history · Invalid vaccine doses
Fellowship approach to reconstructing vaccination history, classifying valid versus invalid doses, building age-banded catch-up plans, using serology selectively, and documenting registers across ANZ, UK, US and Canadian practice.
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Target exams
Red flags
- Under-immunised child with measles or varicella exposure — urgent post-exposure pathway, not a routine booking
- Live vaccine planned in a severely immunocompromised child or pregnant adolescent without safety screen
- Anaphylaxis to a prior vaccine component without specialist review before re-challenge
- Assuming verbal history equals full protection when outbreak risk is high
- Rotavirus or other age-limited vaccine given after product maximum age
Life stages
Care settings
Clinical exam formats
Board mappings
- General and Community Paediatrics — immunisation and preventive care
- Current PREP curriculum — preventive care and immunisation
- Renewed curriculum — Learning goal: clinical assessment and management in community and preventive paediatrics
- Renewed curriculum — Learning goal: communication with patients, families, and health professionals
- General and Community Paediatrics
- Clinical Applications
- Long Cases
- Short Cases
- 4. Professional skills and knowledge: Patient management
- Health promotion and illness prevention
- Foundation of Practice (FOP)
- Applied Knowledge in Practice (AKP)
- History
- Communication
- General Pediatrics Content Outline — Domain 1: Preventive Pediatrics/Well-Child Care
- Immunization schedules and catch-up
- Patient Care — preventive care and immunizations
- Systems-Based Practice 3: System Navigation for Patient Centered Care
- Medical Expert
- Health Advocate
- Pediatrics: Foundations EPA — Communicating assessment findings and management plans to patients and/or families
Two different jobs
Routine schedule
Catch-up
A child who is late is not “behind a birthday list.” They are under-protected against specific diseases until those antigen gaps close. That is the clinical problem this page solves. [2] [8]
Overview & Definition
Parents often arrive with a half-filled book, a photo of a foreign card, or the sentence “I think they had everything.” Your job is to turn that mess into a safe, written plan. Catch-up immunisation means giving the vaccines still needed for the child’s current age after you account for valid past doses. It is not restarting every series from zero when good doses already exist. [1] [2]
Uncertain vaccination history means you cannot verify dates, products, or doses for one or more antigens. Verbal history alone is weak evidence for most antigens. National registers, clinic records, and parent-held cards with dates are stronger. When uncertainty remains after a proper search, the usual default is to vaccinate, not to wait for perfect paperwork. [1] [4]
This page owns history reconstruction, dose validity, multi-visit planning, selective serology, and regional operational differences. Cross-link national schedule comparison, contraindications and adverse events, and vaccine hesitancy topics rather than hiding those full chapters here. [1]
References10ShowHide
- [1]Kroger AT General recommendations on immunization: recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR. Recommendations and reports : Morbidity and mortality weekly report. Recommendations and reports, 2006.PMID 17136024
- [2]Issa AN Advisory Committee on Immunization Practices Recommended Immunization Schedule for Children and Adolescents Aged 18 Years or Younger - United States, 2025. MMWR. Morbidity and mortality weekly report, 2025.PMID 39819853
- [3]Stokley S Evaluation of invalid vaccine doses. American journal of preventive medicine, 2004.PMID 14700710
- [4]Abu-Shamsieh A Pediatric Care for Immigrant, Refugee, and Internationally Adopted Children. Pediatric clinics of North America, 2022.PMID 34794672
- [5]Dvergsdal ET Low Childhood Vaccination Coverage among Ukrainian Refugees in Norway. A Nationwide, Register-Based Cohort Study, 2022-2023. Journal of immigrant and minority health, 2025.PMID 40668470
- [6]Schillie S Prevention of Hepatitis B Virus Infection in the United States: Recommendations of the Advisory Committee on Immunization Practices. MMWR. Recommendations and reports : Morbidity and mortality weekly report. Recommendations and reports, 2018.PMID 29939980
- [7]Nyinawingeri A Using the Australian Immunisation Register to support general practices to improve childhood vaccination rates. Australian journal of general practice, 2024.PMID 38437660
- [8]Hull B Annual Immunisation Coverage Report 2023. Communicable diseases intelligence (2018), 2026.PMID 41730159
- [9]Crockett M New faces from faraway places: Immigrant child health in Canada. Paediatrics & child health, 2005.PMID 19668632
- [10]Liang JL Prevention of Pertussis, Tetanus, and Diphtheria with Vaccines in the United States: Recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR. Recommendations and reports : Morbidity and mortality weekly report. Recommendations and reports, 2018.PMID 29702631