FIGURE 2–2 Immunization coverage levels with the 4:3:1:3aseries, by state (national coverage=79%). a4 DTP, 3 polio, 1 MMR, and 3 Hib. SOURCE: Information provided by CDC.
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Change and Complexity in the National Immunization System ."
Calling the Shots: Immunization Finance Policies and Practices . Washington, DC: The National Academies Press,
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