Figure 5From: Improving disease incidence estimates in primary care surveillance systems Autocorrelation in regional ILI incidence during an epidemic period. (top) National ILI epidemic profile. Week 0 is defined as the epidemic peak. (bottom) Moran’s index computed from regional incidence post-stratified on the number of GPs ( I ^ n r , t , dashed) or on the number of consultations ( I ^ c r , t , plain). The horizontal grey line shows the expected value without spatial autocorrelation.Back to article page