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IID-23 Data Details

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IID-23 Reduce hepatitis A

About the Data

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

Data Source: 
Bridged-race Population Estimates
National Notifiable Diseases Surveillance System
Changed Since the Healthy People 2020 Launch: 
per 100,000
Baseline (Year): 
1.0 (2007)
Target-Setting Method: 
Projection/trend analysis
Target-Setting Method Justification: 
The HP2020 hepatitis A virus incidence target reflects anticipated large reductions based on 1) the extent of decline in recent years, 2) data indicating that relatively low level of vaccination coverage can result in large declines in disease among the nonvaccinated population resulting in a herd immunity effect, and 3) adoption of universal vaccination of all children in 2006. [DHHS18]

Number of new symptomatic hepatitis A cases reported in the past 12 months


Total population in reporting states

Comparable Healthy People 2010 Objective: 
Retained from HP2010 objective
Data Collection Frequency: 
Methodology Notes: 

    Data are rates per 100,000 population based on the number of symptomatic cases of hepatitis A reported to NNDSS. A case definition for new symptomatic cases of hepatitis A is available from CDC.

    To obtain state-specific measures for this measure, local Viral Hepatitis Surveillance Program data are used to determine the number of symptomatic hepatitis A cases occurring in the state in the past 12 months.

    FOR SINGLE DATA YEARS: Case rates are calculated based on the resident population of the United States for the data year involved. For census years (e.g. 2010), population counts enumerated as of April 1 are used. For all other years, populations estimates as of July 1 are used. Postcensal population estimates are used in rate calculations for years after a census year and match the data year vintage (e.g. July 1, 2011 resident population estimates from Vintage 2011 are used as the denominator for 2011 rates). Postcensal population estimates are used in rate calculations for the years between censuses (e.g. 1991-1999, 2001-2009). Race-specific population estimates for 1991 and later use bridged-race categories.

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 2014, Population Estimates was added as a data source to reflect measure's population denominator. The data and target were not revised. In 2015, the denominator data source name was revised from Population Estimates to Bridged-Race Population Estimates for Census 2000 and 2010. The numerator data source, baseline estimate, target, and target-setting method remain unchanged.


Additional resources about the objective

  1. CDC. Prevention of hepatitis A through active or passive immunization: recommendations of the Advisory Committee on Immunization Practices (ACIP). MMWR 2006;55 (No. RR-7).
  2. Centers for Disease Control and Prevention (CDC). Case definitions for infectious conditions under public health surveillance.
  3. Daniels D, Grytdal S, Wasley A. Surveillance for acute viral hepatitis - United States, 2007. MMWR Surveillance Summary. May 22 2009;58(3):1-27.