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Volume 10, Number 10, October 2004 Syndromic Surveillance for Influenzalike Illness in Ambulatory Care SettingBenjamin Miller,* Heidi Kassenborg,† William Dunsmuir,‡ Jayne Griffith,*
Mansour Hadidi,* James D. Nordin,§ and Richard Danila* |
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Figure 4. Cumulative sum (CUSUM) control chart of a hypothetical anthrax release occurring December 17, 2001. CUSUM of the residuals (broken line) is charted over the observed number of influenzalike (ILI) visits to the HealthPartners Medical Group (gray bars) and the additional outbreak-associated ILI cases (white bars). The system threshold, the CUSUM decision interval (solid line), is exceeded on December 24 and remains above threshold until December 30. With high levels of ILI occurring in the winter months, this scenario demonstrates the ability of the system to detect increased ILI visits during influenza season and over the winter holidays. |
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This page last reviewed September 13, 2004 |
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