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Errata: Vol. 53, Supplement, September 24, 2004

In the MMWR Supplement, "Syndromic Surveillance: Reports from a National Conference, 2003," errors occurred in the report, "Should We Be Worried? Investigation of Signals Generated by an Electronic Syndromic Surveillance System --- Westchester County, New York."

On page 191, in the second paragraph under the section "Westchester County's Syndromic Surveillance System," the first sentence should read, "For each syndrome category, the daily rate, defined as the number of visits grouped in a particular syndrome divided by the number of total visits in all hospital EDs for that day, was analyzed to identify any statistically significant increases." Thereafter in this paragraph, the phrase, "number of visits," should read, "rate."

On page 191, in the second paragraph, the definition of a C3 signal should read, "A C3 signal is generated when the sum of all syndrome rates minus the baseline mean plus 1 standard deviation is greater than two standard deviations of the baseline for the previous 3 days. The C3 signal is illustrated as follows: "å [syndrome rate -- (baseline mean + 1 standard deviation) > 2 standard deviations of the baseline], when >1 day exists when the syndrome rate is greater than the baseline mean + 1 standard deviation."

On page 192, in the second paragraph under the section "Terms Used To Identify and Classify Complaints into Syndrome Categories," information on monitoring for false-negative signals should include, "In addition, all chief complaints that are excluded from classification into a syndrome category should be reviewed periodically to ensure that key regional or facility-specific terminology is not being underrepresented in the search filter."

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