Percent Vaccinated more than 14 Days Prior to Illness Onset by Case Control Status and Adjusted Vaccine Effectiveness, by Age Group and Vaccine Type.

1Adjusted for study community, cubic spline of age and time since 10/04/09 in days, insurance status, enrollment site, presence of high risk condition; 2Excludes all with live attenuated vaccination prior to illness onset; 3Excludes all with inactivated pandemic vaccination prior to illness onset and those not aged 2 to 49 years.