| Abstract
| - AIM. To identify factors associated with non-uptake of preschool booster immunisation. DESIGN. Data from the computerised child health system was used to study all children born in 1990 and living in South Glamorgan, Wales, on their 5th birthday. Factors associated with preschool booster uptake were investigated using multiple logistic regression. RESULTS. Preschool booster coverage in the study cohort was 91.4%. After adjustment for other variables, uptake was associated most strongly with completed primary immunisation for diphtheria, tetanus, and polio vaccine or first dose measles, mumps, and rubella vaccine. Identifying children who miss either of these predicts 52.4% of those who miss the preschool booster. CONCLUSION. Effective targeting of children who have missed previous immunisations could improve preschool booster uptake and ensure maximum uptake of at least one dose of measles, mumps, and rubella vaccine. Achieving optimum measles vaccine coverage is vital to achieve the goal of measles elimination. Key messages. High uptake of the new second measles, mumps, and rubella vaccine dose is crucial to achieving measles elimination in the UK Factors influencing uptake of existing preschool booster immunisation are a useful proxy for anticipated uptake of the second measles, mumps, and rubella dose Preschool booster immunisation uptake is associated most strongly with completed primary immunisation with diphtheria, tetanus, and polio or measles, mumps, and rubella vaccines Targeting children who have missed either of these primary immunisations will identify about half of all children at risk of missing the second measles, mumps, and rubella dose
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