The National Immunization Survey (NIS) began collecting data in 1994 for the purpose of establishing estimates of up-to-date immunization levels in each state, the District of Columbia, and 27 large urban areas. The NIS is conducted by the National Opinion Research Center for the Centers for Disease Control and Prevention; it is jointly sponsored by the National Immunization Program and the National Center for Health Statistics. Children between the ages of 19 and 35 months living in the United States at the time of the survey are the target population for the NIS: Data about their immunizations are collected from a parent or other adult from the child's household who is knowledgeable about their immunization record. If possible, this information is confirmed with the child's ...

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