Compliance with guidelines for H1N1 vaccination in pediatric Kaiser Permanente members

This study examined compliance with CDC dosing recommendations for the 2009 H1N1 influenza vaccine among pediatric patients. Guidelines required two doses at least 21 days apart for children under nine, yet many received only one or no doses. Using a cross‑sectional design, we analyzed distributions of children receiving zero, one, or two appropriately timed doses and evaluated differences by demographics, health status, Medicaid enrollment, vaccination timing, and other factors. A multivariable model identified independent predictors of compliance, providing insight into why many children did not complete the recommended series. Findings may help guide targeted health promotion strategies for future influenza seasons.