Table 2.

Key IIS Characteristics Related to Policy, Data Use, and Data Sharing (N = 64)

Metric	Number of IIS (%)
Provider participation
Jurisdictions that reported VFC provider participation in 2018 (N = 61)	57 (93.4)
Percentage of VFC jurisdictions whose provider agreements require VFC providers to report to the IIS (N = 61)	41 (67.2)
IIS to school connectivity
IIS that can identify the number of public elementary schools that were authorized users of the IIS in 2018	28 (43.8)
IIS that can identify the number of public middle schools and high schools that were authorized users of the IIS in 2018	29 (45.3)
Data use and sharing
IIS sent at least one QBP (query by parameter) message in production to another jurisdiction’s IIS in 2018	5 (7.8)
IIS sent at least one VXU (vaccine update) message in production to another jurisdiction’s IIS in 2018	6 (9.3)
IIS is currently using an external source (ie, SmartyStreets) to verify that patient addresses in their IIS are valid	28 (43.8)
IIS used external sources in 2018 (eg, US Postal Service, Lexis-Nexis) to verify whether patients currently reside at the addresses listed in their IIS record, or to update the record to reflect the current address	14 (21.9)

IIS indicates immunization information systems; VFC, vaccines for children.