OBJECTIVES To examine the relationship between the outcome of vaccination for H1N1
influenza and receipt of seasonal
influenza vaccine in Michigan children during the 2009-2010 season, we examined the
influenza vaccination status of all Michigan residents aged six months to 18 years who were enrolled in the Michigan Care Improvement Registry.
METHODS: We calculated descriptive statistics for dichotomous and categorical variables, including numbers of children vaccinated with either
influenza (H1N1) monovalent
vaccine and/or seasonal
influenza vaccine, gender, race! / ethnicity, provider type, moved-or-gone-elsewhere (MOGE) status, and
vaccin type. We used logistic regression, adjusting for potential confounders and effect modifiers (age and MOGE status), to calculate odds ratios associate with H1N1
vaccine status (vaccinated vs. unvaccinated). RESULTS. Michigan children who were vaccinated for seasonal
influenza from August 1, 2009, to February 27, 2010, were 6.26 (95% confidence interval 6.18, 6.34) times as likely as children who were unvaccinated for seasonal
influenza to be vaccinated with H1N1 2009 monovalent
vaccine. Private health-care providers administered 91% of the seasonal
influenza vaccine and 59% of the H1N1
vaccine. CONCLUSIONS. Increasing seasonal
influenza vaccination campaign efforts could also benefit pandemic
influenza vaccination efforts. Special educational outreach to parents regarding the importance of
influenza vaccination for all children, regardless of age, may be needed. Stocking and offering traditional seasonal
vaccine with pandemic-specific
vaccine may aid in increasing immunization uptake. Efforts should be made to ensure that private providers are supplied with adequate pandemic
vaccine as part of preparedness planning.