• Animal Health
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• Animal Disease Information
 /  
• Equine Health
 /  
• West Nile Virus

Equine West Nile Virus Case Reporting and Surveillance Information

• 2017 Reported Equine Cases of West Nile Virus
• West Nile virus distribution maps, 1999 - 2017. Annual trends in U.S. distribution of equine West Nile virus cases
   
• Annual Summary Reports 2006-2017. Number of confirmed eastern equine West Nile cases by State and County.
  
  
  • 2017 Summary of Equine West Nile Virus Cases in the United States
    
  • 2016 Summary of Equine West Nile Virus Cases in the United States 
  • 2015 Summary of Equine West Nile Virus Cases in the United States
  • 2014 Summary of Equine West Nile Virus Cases in the United States
  • 2013 Summary of Equine West Nile Virus Cases in the United States
  • 2012 Summary of Equine West Nile Virus Cases in the United States
  • 2011 Summary of Equine West Nile Virus Cases in the United States
  • 2010 Summary of Equine West Nile Virus Cases in the United States
  • 2009 Summary of Equine West Nile Virus Cases in the United States
  • 2008 Summary of Equine West Nile Virus Cases in the United States
  • 2007 Summary of Equine West Nile Virus Cases in the United States
  • 2006 Summary of Equine West Nile Virus Cases in the United States 
     
• State web sites with equine West Nile virus case reports
   
• USGS West Nile Virus Maps - USGS Disease Maps Web site, produced in cooperation with CDC and ArboNET, includes current and historic maps of veterinary, human, bird, sentinel, and mosquito West Nile virus cases by state and county. Veterinary maps on this site include data for several animal species in addition to horses (e.g., dogs, rodents).
   
• West Nile Virus case definition (PDF, 150K)

Surveillance Information

Reports of equine cases of arboviral (i.e., arthropod-borne virus) diseases, including West Nile Virus, are reported to ArboNET, an electronic-based surveillance and reporting system used to track and report arboviral activity. ArboNET captures laboratory-confirmed positive cases in humans, horses, other mammals, birds and mosquitoes across the United States. Equine case-finding varies by State, but primarily relies on passive reporting from private practitioners and diagnostic submissions. In some States, reporting is mandatory.