Figure 2From: Annual economic impacts of seasonal influenza on US counties: Spatial heterogeneity and patterns Spatial heterogeneity between US counties, in terms of (a) Kriging estimated influenza like illness (ILI) visits (per 100,000 persons), (b) Standard errors of ILI estimation, (c)Daily average wage as an indicator of income level, (d)Percentage of vulnerable population (age <5 and >50 years). Back to article page