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Related Experiment Videos

Estimating immunisation coverage: is the 'third dose assumption' still valid?

Brynley P Hull1, Glenda L Lawrence, C Raina MacIntyre

  • 1National Centre for Immunisation Research and Surveillance of Vaccine Preventable Diseases, Children's Hospital at Westmead and the University of Sydney, New South Wales. brynleyh@chw.edu.au

Communicable Diseases Intelligence Quarterly Report
|September 27, 2003
PubMed
Summary
This summary is machine-generated.

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The "third dose assumption" for childhood immunisation coverage is valid, accurately reflecting vaccination status in Australia. This method is crucial for reliable national immunisation estimates.

Area of Science:

  • Public Health
  • Epidemiology
  • Vaccinology

Background:

  • Immunisation coverage in Australia is calculated using the Australian Childhood Immunisation Register (ACIR).
  • The 'third dose assumption' presumes prior doses are received if the third is recorded, impacting coverage estimates.
  • Accurate immunisation data is vital for public health surveillance and policy.

Purpose of the Study:

  • To validate the 'third dose assumption' used for ACIR data.
  • To quantify the impact of this assumption on 12-month immunisation coverage estimates.
  • To assess the accuracy of immunisation records and identify potential under-reporting.

Main Methods:

  • A sample of children born in 1999, deemed fully immunised at 12 months via the 'third dose assumption', were selected from the ACIR.

Related Experiment Videos

  • Parents were telephonically interviewed to gather data on unrecorded vaccinations.
  • Coverage estimates were recalculated based on survey data to determine the assumption's impact.

    • Main Results:

    • Of 219 children assessed using the assumption, 96.8% met 'definite' immunisation criteria for all doses.
    • The 'third dose assumption' slightly overestimated coverage by 0.2%.
    • Excluding the assumption would have led to a 7% underestimation of national coverage.

    Conclusions:

    • The 'third dose assumption' is a valid and essential method for calculating immunisation coverage from the ACIR.
    • Despite improvements, under-reporting of early childhood vaccine doses persists.
    • The 'third dose assumption' methodology may be transferable to other national immunisation registries.