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Prevalence of seasonal influenza vaccination by study site and influenza season among mothers of non-malformed infants participating in the Slone Epidemiology Center’s Birth Defects Study, 2006–10. Seasonal coverage was estimated among 2136 women during the following influenza seasons: 2006–07 (n = 499), 2007–08 (n = 715), 2008–09 (n = 743), and 2009–10 (n = 799). Individual season numbers do not sum to total because of non-mutually exclusive influenza season exposure.
