Eastern and Western Equine Encephalitis Cases and Surveillance Information
Annual Summary Reports 2006-2018.
Number of confirmed eastern equine encephalitis cases by State and County
- 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:
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.