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Percentage of adults aged ≥19 years participating in an immunization information system (IIS)* — United States, five cities,† and the District of Columbia (DC), 2012
* Adult participation is defined as having one or more vaccinations administered to adults aged ≥19 years documented in an IIS. National adult participation = 25%.
†Chicago, Illinois; New York, New York; Philadelphia, Pennsylvania; Houston, Texas; and San Antonio, Texas.
