International Equine Disease Report, First Quarter 2008

The International Collating Centre, Newmarket, England, and other sources reported the following disease outbreaks:

Cases of African horse sickness (AHS) occurred in South Africa during the fourth quarter of 2007 and continued in 2008. The outbreak affected mainly young, unvaccinated, non-Thoroughbred breeding animals on a variety of premises, although vaccinated animals were also affected. Northern and eastern parts of South Africa are endemic for AHS, and cases are recorded annually. Equine encephalosis virus (EEV) serotypes 4 and 7 are also endemic in South Africa, occurring during the summer months. Approximately 1,000 Thoroughbred and non-Thoroughbred performance and breeding horses were reported as infected with EEV.

Contagious equine metritis (CEM) was confirmed in a single non-Thoroughbred horse in France.

Cases of abortion attributable to equine herpesvirus type-1 (EHV-1) infection were confirmed in Ireland (nine cases on five premises), Japan, (18 cases on 14 premises), the United Kingdom (three cases), and Central Kentucky, USA (10 cases among Thoroughbred mares on 10 farms). A single abortion attributable to EHV-4 was diagnosed both in Ireland and in the United Kingdom. An outbreak of paralytic disease caused by the non-neuropathogenic strain of EHV-1 was reported on a premise in France, affecting a non-Thoroughbred stallion and two mares that aborted. The paralytic form of EHV-1 was confirmed in one euthanized horse in the state of Delaware, USA.

A single clinical case of equine infectious anemia (EIA) was identified in Bavaria, Germany, in a horse that was subsequently euthanized.

The last cases of equine influenza in Australia were reported on December 9, 2007, in New South Wales and on December 25 in Queensland. Other states and territories in Australia have remained free of influenza. There has been free movement of horses throughout Australia since March 14, 2008, and an extensive influenza surveillance program continues to be in place. In Japan, positive cases of influenza were detected at the Japan Racing Association (JRA) Ritto Training Center during January and in February at the Miho Training Center, with no new cases reported since March 11. Several riding horses stabled at Tokyo Racecourse and Chukyo Racecourse tested positive during February and March, respectively. Recent influenza isolates in Japan show no signs of antigenic change from Ibaraki/07 isolated in August 2007. At non-JRA facilities, several horses tested positive in January, and positive cases among riding horses throughout the country have been reported. Equine influenza was widely reported in the north of Sweden during January, primarily among trotting horses that had not been correctly vaccinated. Switzerland reported an outbreak on one premise among vaccinated non-Thoroughbred horses.

Four cases of Leptospira abortion were diagnosed among Thoroughbred mares in Central Kentucky during January, and cases of salmonellosis were diagnosed on two premises involving Thoroughbred horses during January in Japan. Strangles was reported on premises in France, Ireland, Sweden, Switzerland, and the USA.

This is an excerpt from Equine Disease Quarterly, funded by underwriters at Lloyd's, London, brokers, and their Kentucky agents. More articles from Equine Disease Quarterly...

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