Abstract
©2015 Association of Schools and Programs of Public Health Immunization information systems (IISs) are confidential, population-based, computerized databases that record all immunization doses administered by participating providers to people residing within a given geographic area.1 Wellmaintained IISs can generate a patient’s complete immunization history by consolidating vaccination records from different providers. They have the potential to solve an age-old problem in immunization recordkeeping—incompleteness caused by the movement of patients from one jurisdiction to another. When IISs are able to exchange real-time, bidirectional data among jurisdictions, they allow providers to effortlessly query immunization information in a different jurisdiction and correctly assess a patient’s immunization status. This ability to assess immunization status can reduce missed vaccination opportunities and prevent over-vaccination in everyday practice and during outbreaks or natural disasters. The exchange of IIS data also can support public health by generating more accurate jurisdiction-level reports, thereby enhancing efforts to target communities with low vaccination rates. However, to meet their potential, IISs must be able to share data across jurisdictions, something that is not possible for many IISs because of a lack of time, money, other resources, or the absence of necessary legal agreements.
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