Figure 1
From: Event-based internet biosurveillance: relation to epidemiological observation
Argus alerts and WHO case counts by week. Y axes are all fixed to the same scale in this graph. Note that December 24th 2009 to January 3rd 2010 (week 52, 2009 to week 1, 2010) was a holiday period for Project Argus with substantially reduced reporting volume.