Use of Automated Ambulatory-Care Encounter Records for Detection of Acute Illness Clusters, Including Potential Bioterrorism Events
, Ken Kleinman‡§, Inna Dashevsky‡, Courtney Adams‡, Patricia Kludt¶, Alfred DeMaria¶, and Richard Platt*‡§
Author affiliations: *Brigham and Women’s Hospital, Harvard Medical School, Boston, Massachusetts, USA; †University of Sydney School of Public Health, Sydney, Australia; ‡Harvard Pilgrim Health Care and Harvard Vanguard Medical Associates, Boston, Massachusetts, USA; §CDC Eastern Massachusetts Prevention Epicenter and HMO Research Network Center for Education and Research in Therapeutics, Boston, Massachusetts, USA; ¶Massachusetts Department of Public Health, Boston, Massachusetts, USA;
Figure 2. Daily incidence rates of lower respiratory and influenza-like illness after December 17, 2001, showing that within-week variation is substantially greater than seasonal variation.
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