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MMWR Suppl. 2004 Sep 24;53:159-65.

ESSENCE II and the framework for evaluating syndromic surveillance systems.

Author information

1
Johns Hopkins University Applied Physics Laboratory, 11100 Johns Hopkins Rd, Laurel, MD 20723, USA. Joe.Lombardo@jhuapl.edu

Abstract

INTRODUCTION:

The Electronic Surveillance System for the Early Notification of Community-Based Epidemics (ESSENCE II) is a prototype syndromic surveillance system for capturing and analyzing public health indicators for early detection of disease outbreaks.

OBJECTIVES:

This paper presents a preliminary evaluation of ESSENCE II according to a CDC framework for evaluating syndromic surveillance systems.

METHODS:

Each major topic of the framework is addressed in this assessment of ESSENCE II performance.

RESULTS:

ESSENCE captures data in multiple formats, parses text strings into syndrome groupings, and applies multiple temporal and spatio-temporal outbreak-detection algorithms. During a recent DARPA evaluation exercise, ESSENCE algorithms detected a set of health events with a median delay of 1 day after the earliest possible detection opportunity.

CONCLUSIONS:

ESSENCE II has provided excellent performance with respect to the framework and has proven to be a useful and cost-effective approach for providing early detection of health events.

PMID:
15714646
[Indexed for MEDLINE]
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