Fig. 1From: Comparison of crowd-sourced, electronic health records based, and traditional health-care based influenza-tracking systems at multiple spatial resolutions in the United States of Americaa Correlation of EHR (blue) with CDC ILINet by mean visits at the regional and state resolution across all seasons (b) Correlation of the crowd-sourced system (red) with CDC ILINet and BPHC (star) by mean reports at the regional, state, and city resolutions across all seasons (c) EHR correlation category (blue) by percent of total visits (d) Crowd-sourced correlation category (red) by percent of total reportsBack to article page