Emerging Infectious Disease ISSN: 1080-6059
Volume 8, Number 8—August 2002
Research
Use of Automated Ambulatory-Care Encounter Records for Detection of Acute Illness Clusters, Including Potential Bioterrorism Events
Figure 2

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.
Lessons from the History of Quarantine, from Plague to Influenza A
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