Vaccination Timeliness Among US Children Aged 0-19 Months, National Immunization Survey–Child 2011-2021

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Abstract
The immunization schedule recommended by the US Advisory Committee on Immunization Practices (ACIP) details how vaccinations should be provided at birth and ages 2, 4, 6, 12 to 15, and 15 to 18 months. National vaccination coverage is typically measured as the percentage of US children who have received recommended vaccinations by a certain age, such as by their second birthday.1 However, these coverage measures do not reflect whether children received vaccinations on time, by the ages recommended by the ACIP.

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