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Influenza-like Illness Awareness System (IIAS)

Creek in the mountains

The Influenza-like Illness Awareness System (IIAS) was established as part of IHS’ response to the influenza (H1N1) pandemic beginning in 2009. The mission of the IIAS has been to inform IHS staff at all levels, from senior leadership to personnel in the field, on weekly influenza-like illness prevalence and influenza vaccine coverage.


The IIAS was designed to monitor influenza-like illness prevalence geographically, and to monitor influenza vaccine uptake in the same populations. The system is dependent upon IHS, Tribal, and Urban health facilities participating in and automatically submitting export files containing specified information on a daily basis. Standardized and formatted reports are then made available to customers on a weekly basis. Once established in a production capacity, the IIAS has been informing awareness about influenza-like illness and influenza vaccine uptake since 2009.

Surveillance Reports

Below are seasonal influenza reports from previous flu seasons. For additional past reports, please visit the Archive page.

IIAS Guidance Documents and Resources