Statistics & Maps

West Nile virus disease is a nationally notifiable condition. Cases are reported to CDC by state and local health departments using standard case definitions. Arboviral surveillance data are reported to CDC through ArboNET. In addition to human disease, ArboNET maintains data on arboviral infections among presumptive viremic blood donors, veterinary disease cases, mosquitoes, dead birds, and sentinel animals.

• Preliminary Maps & Data for 2017
• Preliminary Maps & Data for 2016
• Final Maps & Data for 1999–2015
  • Cumulative Maps & Data
  • Annual Maps & Data

Arboviral surveillance data are also available at the webpages of the following organizations:

• AABB (American Association of Blood Banks): West Nile virus viremic blood donor maps
• Public Health Agency of Canada (PHAC): West Nile virus surveillance data for Canada