Population
Preschool children (under 5 years of age)
Design
Cross-sectional
Authors
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Documents historical vaccine uptake gaps in vulnerable children; leaves open whether similar disparities persist today and merit targeted study.
The study highlights gaps in poliovirus immunization among preschool children, particularly in lower socioeconomic areas and non-white populations in the US.
Poland et al. (1968) studied this question.
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