A. These ICPCviews correspond to 3 specific weeks surrounding the 2006 flu outbreak. The patient numbers were subtracted from the control ICPCview of 200 codes randomly chosen from the rest of the year; only the positive differences have been retained. Color coding is as described in the legend to Figure 2. The outbreak period was defined using the Serfling method . B. Enlarged views of the General and Digestive patterns generated during the 3 weeks of interest.