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IID-1.2 Data Details

IID-1.2 Reduce serotype b cases of Haemophilus influenzae (Hib) invasive disease among children under age 5 years

About the Data

Description of the data source, numerator, denominator, survey questions, and other relevant details about the national estimate.

National Data Source
Active Bacterial Core Surveillance (ABCS); Centers for Disease Control and Prevention, National Center for Immunization and Respiratory Diseases (CDC/NCIRD)
Changed Since the Healthy People 2020 Launch
per 100,000 
Baseline (Year)
0.30 (2008)
Target-Setting Method
10 percent improvement
Estimated number of all reported confirmed and probable cases of Haemophilus influenzae invasive disease for children under age 5 years
Data Collection Frequency
Comparable Healthy People 2010 Objective
Adapted from HP2010 objective
Methodology Notes

Data reflect cases of Hib disease among children less than 5 years of age submitted to Active Bacterial Core surveillance.

The Active Bacterial Core surveillance (ABCs) system is an active laboratory and population-based surveillance system that provides reports of H. influenzae cases from all or parts of 10 states in the United States. ABCs is supported by the CDC as part of its Emerging Infections Program network. The population under surveillance was 36,748,349 in 2009 (representing 12.0% of the US population).

A case was defined as isolation of H. influenzae from a normally sterile body site (eg, blood or cerebrospinal fluid) in a person aged <5 years. Illness outcome was based on patient status at the time of hospital discharge. Serotyping of H. influenzae was performed by using slide agglutination or polymerase chain reaction. All isolates from ABCs sites were sent to the CDC, where serotype was confirmed by using slide agglutination, Haemophilus quad identification plates or API Neisseria-Haemophilus strips, and polymerase chain reaction. The CDC result was used as the final serotype in the ABCs data set. This measure includes confirmed cases of H. influenzae type b disease.

Caveats and Limitations
ABCs Areas California (3 county San Francisco Bay area); Colorado (5 county Denver area); Connecticut; Georgia; Maryland; Minnesota; New Mexico; New York (15 county Rochester and Albany areas); Oregon; Tennessee (20 urban counties) ABCs Population The surveillance areas represent 41,981,509 persons. Source: National Center for Health Statistics bridged-race vintage 2010 postcensal file

Revision History

Any change to the objective text, baseline, target, target-setting method or data source since the Healthy People 2020 launch.

Description of Changes Since the Healthy People 2020 Launch

In 2013, the objective statement was changed from "aged 5 years or under" to "under age 5 years" to make the age group consistent with the numerator definition. In 2013, the NNDSS data source was removed. NNDSS data were insufficient to assess Hib with any degree of confidence because Haemophilus influenzae serotyping information was often missing.


Additional resources about the objective.

  1. Centers for Disease Control and Prevention (CDC). Case definitions for infectious conditions under public health surveillance. Morbidity and Mortality Weekly Report 46 (RR-10), 1997. (Updated case definitions can be found at: