Petrie JG, Fligiel H, Lamerato L, Martin ET, and Monto AS. Agreement between state registry, health record, and self-report of influenza vaccination. Vaccine 2021; 39(38):5341-5345.
BACKGROUND: Documentation of influenza vaccination, including the specific product received, is critical to estimate annual vaccine effectiveness (VE).
METHODS: We assessed performance of the Michigan Care Improvement Registry (MCIR) in defining influenza vaccination status relative to documentation by provider records or self-report among subjects enrolled in a study of influenza VE from 2011 through 2019.
RESULTS: The specificity and positive predictive value of MCIR were high; however, >10% of vaccinations were identified only by other sources each season. The proportion of records captured by MCIR increased from a low of 67% in 2013-2014 to a high of 89% in 2018-2019, largely driven by increased capture of vaccination among adults.
CONCLUSIONS: State vaccine registries, such as MCIR, are important tools for documenting influenza vaccination, including the specific product received. However, incomplete capture suggests that documentation from other sources and self-report should be used in combination with registries to reduce misclassification.