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Vaccine. 2010 Jul 19;28(32):5254-9. doi: 10.1016/j.vaccine.2010.05.061. Epub 2010 Jun 8.

Accuracy of influenza vaccination status in a computer-based immunization tracking system of a managed care organization.

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  • 1Kaiser Permanente Southern California, 100 South Los Robles Ave., Pasadena, CA 91101, USA.


Influenza vaccine safety and effectiveness studies conducted using electronic medical records rely on accurate assessment of influenza vaccination status. However, influenza immunization in non-traditional settings (e.g., the workplace) may not be captured in patient immunization tracking systems. We compared influenza vaccination status from electronic records with self-reported vaccination status for five hundred and two 50-79 years olds enrolled in a large managed care organization. Influenza vaccination status in the medical record had a high positive predictive value and specificity (both >99%). The negative predictive value was 80% and sensitivity was 78%. These data suggest that an electronic record of influenza vaccination reliably indicates immunization, while the absence of such a record is only moderately accurate, partly due to vaccines received in non-traditional settings.

(c) 2010 Elsevier Ltd. All rights reserved.

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