Data and Maps for West Nile

Key points

  • West Nile virus disease (West Nile) is a nationally notifiable condition.
  • Cases are reported to CDC by state and territorial health departments using standard case definitions.
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Overview

Cases of West Nile have been reported in states across the contiguous United States. West Nile virus activity typically occurs during the summer months and into the fall. The annual number of reported West Nile cases can fluctuate widely, as a result of periodic epidemics.

Keep Reading About West Nile

ArboNET

West Nile 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.

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Content Source:
National Center for Emerging and Zoonotic Infectious Diseases (NCEZID)