To monitor the occurrence of invasive Hib disease over time and to determine product-specific rates of invasive Hib disease within the monitored population.

The purpose of the study is to conduct surveillance for Hib disease.

Prospective active population-based surveillance for invasive Hib disease, conducted by the Center for Disease Control and Prevention (CDC) Active Bacterial Core (ABCs) program within geographic regions currently representing 12% of the US population, will provide Hib case-occurrence (numerator) data.

The ABCs program and the National Center for Health Statistics will provide annual estimates of the number of persons under surveillance, by age group, within the ABCs catchment area.

Ongoing telephone sample surveys, conducted by M/A/R/C, a national sampling organization, will provide brand-specific vaccine exposure data by age group within the ABCs program catchment area at appropriate pre-specified intervals (denominator data).

Inclusion Criteria:

• Residence within the geographic scope of Active Bacterial Core surveillance (ABCs) during the period of surveillance
• Aged 0 through 59 months (prior to 5th birthday) on the day of inclusion for Hib disease surveillance and 2 through 23 months (prior to 2nd birthday) for Hib vaccine brand usage survey.
• 2009-2014 calendar years inclusive.
• For the Hib vaccine usage survey, agreement to complete the required survey.

Exclusion Criteria:

Not applicable.

5.2 million person years over the 6 year study period

Qualified researchers may request access to patient level data and related study documents including the clinical study report, study protocol with any amendments, blank case report form, statistical analysis plan, and dataset specifications. Patient level data will be anonymized and study documents will be redacted to protect the privacy of trial participants. Further details on Sanofi's data sharing criteria, eligible studies, and process for requesting access can be found at: https://vivli.org