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IID-1.5 Data Details

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IID-1.5 Reduce cases of mumps (U.S.-acquired cases)

About the Data

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

Data Source: 
National Notifiable Diseases Surveillance System
Changed Since the Healthy People 2020 Launch: 
Baseline (Year): 
421 (2008)
Target-Setting Method: 
Projection/trend analysis
Target-Setting Method Justification: 
Prior to 2004, some progress was made in mumps disease reduction, reflected by a two-thirds reduction in cases from 1998 (666 cases) to 2003 (231 cases), thus meeting the reduction target of 250 cases for that year. However, in 2004, the reduction target was 200, and the number of reported mumps cases was 258. The disease reduction target was not met for that year or for 2005.

Number of confirmed and probable U.S.-acquired cases of mumps

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

    A case definition for confirmed and probable U.S.-acquired cases of mumps is available from CDC.

    Although the measles-mumps-rubella (MMR) vaccine is very effective, protection against mumps is not complete. Two doses of measles-mumps-rubella (MMR) vaccine are 88% effective at protecting against mumps; one dose is 78% effective. Outbreaks can still occur in highly vaccinated U.S. communities, particularly in close-contact settings. In recent years, outbreaks have occurred in schools, colleges, and camps. High vaccination coverage helps limit the size, duration, and spread of mumps outbreaks.

Target Calculation Methods: 
The Healthy People 2020 target for IID-1.5 of 500 mumps cases was set aiming for a realistic target and keeping in mind that the number of mumps cases vary from year to year. The baseline year, 2008, happened to be a year without an outbreak.


Additional resources about the objective

  1. Centers for Disease Control and Prevention (CDC). Case definitions for infectious conditions under public health surveillance.