Keywords: West nile virus cases in United States 2009.png en West Nile virus cases in United States 2009 Cumulative 2009 Data as of 3 am May 04 2010 National Cumulative Human Disease Cases 720 2012-09-05 08 30 01 http //diseasemaps usgs gov/2009/wnv_us_human html USGS PD-USGov Uploaded with UploadWizard West Nile virus |