Additional File 6.

Hotspots of swine production and AIV cases in wild birds in the contiguous US. This file shows the overlap between areas with intensive swine production in the US and areas in which we predict high prevalence of AIV in wild birds. Reassortment between avian and swine influenza viruses may be more common in such areas.

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Fuller et al. BMC Infectious Diseases 2010 10:187   doi:10.1186/1471-2334-10-187