Volume 22, Number 1—January 2016
Letter
Highly Pathogenic Avian Influenza Virus, Midwestern United States
Figure

Figure. Distribution of outbreaks caused by highly pathogenic avian influenza (HPAI) virus, subtype H5, in domestic poultry compared with domestic poultry flock density and direction of wild waterfowl migration. Triangles represent outbreaks caused by HPAI virus, subtype H5, in domestic poultry; blue circles represent HPAI virus, subtype H5 outbreaks in wild birds. Blue shading indicates migratory waterfowl wintering and breeding regions, and arrows represent general direction of seasonal movements. Pink shading indicates density of domestic poultry holdings, with darker shades representing areas where flock densities are higher.
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