Volume 10, Number 10, October 2004

Syndromic Surveillance for Influenzalike Illness in Ambulatory Care Setting

Benjamin Miller,* Heidi Kassenborg,† William Dunsmuir,‡ Jayne Griffith,* Mansour Hadidi,* James D. Nordin,§ and Richard Danila*
*Minnesota Department of Health, Minneapolis, Minnesota, USA; †Minnesota Department of Agriculture, St. Paul, Minnesota, USA; ‡University of New South Wales, Sydney, Australia; and §HealthPartners Research Foundation, Minneapolis, Minnesota, USA

Figure 3. Cumulative sum (CUSUM) control chart of a hypothetical anthrax release occurring June 26, 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 June 30 and remains above threshold until July 9. With relatively low levels of ILI occurring in the summer months, this scenario demonstrates the ability of the system to detect increased ILI visits on weekdays and over the Fourth of July holiday.

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This page last reviewed September 13, 2004

Emerging Infectious Diseases Journal
National Center for Infectious Diseases
Centers for Disease Control and Prevention