According to the October issue of Equine Disease Quarterly (funded by underwriters at Lloyd’s, London, brokers, and their Kentucky agents), a significant increase in the number of equine cases of Eastern equine encephalitis (EEE) was reported in the United States during June compared to numbers in recent years. The number of equine cases of West Nile virus (WNV) reported by the USDA as of Sept. 5 was 1,193, with Colorado, New Mexico, and Wyoming each reporting more than 100 cases. Only two states, Oregon and Nevada, are currently recognized as completely free of WNV. (The International Collating Centre, Newmarket, and other sources reported these disease outbreaks.)

Equine-confirmed or probable cases of WNV have been reported in five provinces of Canada–Alberta, Manitoba, Ontario, Quebec, and Saskatchewan