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Immunisation surveillance: a comparison of four methods in Canterbury
1Department of Community Health and General Practice, Christchurch School of Medicine.
Insights
The immunisation benefit claim system is the most practical method for tracking vaccination coverage, but requires improvements for reliability. Other methods like vaccine distribution and school entry data were less effective for immunisation surveillance.
Area of Science:
- Public Health
- Epidemiology
- Immunisation Surveillance
Background:
- Accurate immunisation coverage data is crucial for public health.
- Evaluating different surveillance methods is essential for optimizing data collection.
Purpose of the Study:
- To compare the effectiveness of four immunisation surveillance methods.
- To assess the reliability of the National Immunisation Coverage Survey against other data sources.
Main Methods:
- Utilized data from vaccine distribution, general practitioner immunisation benefit claims, and school entry coverage.
- Calculated immunisation estimates for Canterbury using existing data and live births.
- Conducted a survey following a World Health Organization protocol.
Main Results:
- Vaccine distribution data proved ineffective for surveillance.
- School entry data limitations hindered complete evaluation.
- Inconsistencies were noted between survey estimates and benefit claims, and across different regions and time periods.
Conclusions:
- The immunisation benefit claim system is the most feasible surveillance method but needs refinement.
- Further evaluation and improvement are necessary for reliable immunisation coverage surveillance.
- The study discusses the practical feasibility of each evaluated surveillance method.
Aims:
To evaluate four methods of immunisation surveillance by comparing the estimates obtained for Canterbury in the National Immunisation Coverage Survey with estimates calculated using data on immunisation distribution, general practitioner immunisation benefit claims and immunisation coverage at school entry.
Methods:
Estimates were calculated using existing data sources on vaccine distribution, immunisation benefit claims, school entry immunisation coverage and live births in Canterbury. The survey was conducted according to a WHO protocol.
Results:
The estimates based on vaccine distribution were of no use. The school entry data available did not allow complete evaluation of this method, which has some potential advantages. A number of inconsistencies were found between estimates from the survey and from immunisation benefit claims, between north and south Canterbury and between the two years for which estimates were calculated using benefit claims.
Conclusions:
It is concluded that the most practicable option, the immunisation benefit claim system, would require careful evaluation and improvement before it could be relied upon for immunisation coverage surveillance. The feasibility of each method as a means of immunisation surveillance is discussed.
