Abstract
In spite of difficulty measuring the effects of varying national immunization coverage rates, attaining high levels of immunization is a high priority for all countries. In addition, immunization rates among preschool children serve as a useful index of overall well child and preventive care. International comparisons reveal relatively low rates among all US children, especially minorities, attributable in part to poor utilization of routine preventive services. In the absence of a national initiative, various attempts to improve performance at local and state levels deserve attention. Renewed monitoring of immunization rates among preschool children in the United States is essential to assess current programs and future efforts.

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