Monitoring New Adolescent Immunization Uptake using Immunization Information System (IIS): Early Trends from Oregon's CDC Sentinel IIS Surveillance Population

Learning Objectives for this Presentation:
By the end of the presentation participants will be able to
-Describe sentinel surveillance.
-Discuss Oregon's TdaP and MCV adolescent rates.
-Identify opportunities to increase rates.

Background:
After over 10 years of IIS building, IIS are primary sources for client-level immunization record data and becoming useful for population-based surveillance. Oregon hosts a CDC-funded IIS Sentinel project using ALERT data from a growing 12-zipcode in the greater Portland area to monitor child immunization coverage. Pertussis also continues in Oregon. In the last years, the Advisory Committee on Immunization Practices (ACIP) has recommended new adolescent vaccinations and the Vaccine for Children's Program is incorporating them. In the last year, sentinel projects added adolescent immunization surveillance activities.

Objectives:
To monitor early vaccine uptake of the new Tetanus Toxoid, Reduced Diphtheria Toxoid and Acellular Pertussis Vaccine (TdaP) and Meningococcal Conjugate Vaccine (MCV) among Oregon sentinel-area adolescents.

Methods:
To ensure adequate population and vaccine capture, Oregon's sentinel site maintains provider reporting, vaccination capture, and data quality at CDC standards. Quarterly since October 2006, vaccination records for 31,000-33,000 rolling cohorts of adolescents aged 11-18 with sentinel-area addresses are extracted. Up-to-date vaccination rates for 3 age cohorts are calculated using assessment dates 1-1.5 months prior to extracts allowing for reporting catch-up.

Results:
Rates for > 1 TdaP rose steadily from 22.6% to 24.7% for 11-12 year olds; 45.1% to 50.5% for 13-15 year olds; and 52.64% to 56.3% for 16-18 year olds, respectively from October 2006 to July 2007. Whereas, rates for > 1 MCV4 rose steadily from 3.3% to 5.9% for 11-12 year olds; 5.3% to 11.3% for 13-15 year olds; and 5.4% to 10.8% for 16-18 year olds, respectively from October 2006 to July 2007.

Conclusions:
These and other rates provide baseline adolescent vaccine uptake information. As in other states, Oregon has a ways to go to achieve higher coverage.