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Percentage of children aged <6 years participating in an immunization information system (IIS)* — United States, five cities,† and the District of Columbia (DC), 2012
* Child participation is defined as having two or more vaccinations for children aged <6 years documented in the IIS. National child participation = 86%.
†Chicago, Illinois; New York, New York; Philadelphia, Pennsylvania; Houston, Texas; and San Antonio, Texas.
