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JAMA. 2002;288:1713-1714.

	Since this article does not have an abstract, we have provided the first 150 words of the full text and any section headings.

MMWR. 2002;51:664-666

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Each annual birth cohort in the United States comprises approximately four million infants. Maintaining the gains in childhood vaccination coverage attained during the 1990s among these children poses an ongoing challenge for public health. The National Immunization Survey (NIS) is an ongoing survey that provides estimates of vaccination coverage among children aged 19-35 months on the basis of data for the most recent 12 months for each of the 50 states and 28 selected urban areas. This report presents NIS findings for 2001,* which indicate a substantial nationwide increase in coverage with 1 dose of varicella vaccine (VAR), generally steady coverage for other vaccines nationwide, and wide variability in coverage among the states and urban areas covered by NIS.

To collect vaccination data for all age-eligible children, NIS uses a quarterly random-digit–dialing sample of telephone numbers for each survey area. NIS methodology, including how the . . . [Full Text of this Article]

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