Eastern and Western Equine Encephalitis
Eastern and Western Equine Encephalitis Surveillance Data
- 2012 Eastern Equine Encephalitis Equine Case Reports (pdf, updated 12/11/2012)
- Eastern equine encephalitis distribution maps, 2003 - 2012. Annual trends in U.S. distribution of eastern equine encephalitis cases.
- Annual Summary Reports - Numbers of confirmed eastern equine encephalitis cases by State and County
- 2011 Summary of Eastern Equine Encephalitis Cases in the United States (pdf)
- 2010 Summary of Eastern Equine Encephalitis Cases in the United States (PDF, 153K)
- 2009 Summary of Eastern Equine Encephalitis Cases in the United States (PDF, 153K)
- 2008 Summary of Eastern Equine Encephalitis Cases in the United States (PDF, 383K)
- 2007 Summary of Eastern Equine Encephalitis Cases in the United States (PDF, 80K)
- 2006 Summary of Eastern Equine Encephalitis Cases in the United States (PDF, 58K)
- State web sites with equine eastern or western equine encephalitis case reports
- USGS Eastern and Western Equine Encephalitis 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 EEE and WEE cases by state and county. Veterinary maps on this site include data for several animal species in addition to horses (e.g., dogs, rodents).
- Case Definitions:
- Eastern Equine Encephalitis Case Definiition (PDF, 143K)
- Western Equine Encephalitis Case Definition (PDF, 141K)
Surveillance Information
Reports of equine cases of arboviral (i.e., arthropod-borne virus) diseases, including eastern and western equine encephalitis, 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.