Keywords: West nile virus case in United States 2007.png en West Nile virus case in United States in 2007 Cumulative 2007 Data as of 3 am May 20 2008 National Cumulative Human Disease Cases 3630 2012-09-05 08 24 28 http //diseasemaps usgs gov/2007/wnv_us_human html USGS PD-USGov Uploaded with UploadWizard West Nile virus |