International Disease Report Second Quarter 2007

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

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

Contagious Equine Metritis was confirmed in three trotting horses ages 7, 8, and 9 in the Orne region of France. Four cases of Eastern equine encephalitis were reported in Florida, USA.

Cases of respiratory disease caused by equine herpesvirus (EHV) were widely reported among a variety of horse breeds in France and in two racehorses in the United Kingdom. Abortions attributable to EHV-1 were reported among trotting mares in Orne and Saddlebred mares in the Calvados region of France. Japan reported cases of EHV-1 among Thoroughbred and non-Thoroughbred mares on five premises. Four cases were confirmed in the United Kingdom, including two attributable to EHV-4. Twenty-two cases of EHV-1 abortion were diagnosed among Thoroughbred mares during the 2007 foaling season in Central Kentucky. Cases of the paralytic form of EHV-1 were reported at the end of April at Balmoral Park, a Standardbred racetrack in Illinois, USA. Three cases of coital exanthema (EHV-3) among two Thoroughbreds and a Falabella stallion were reported in the United Kingdom.

As the result of an extensive survey among horses entering competitions or other equine events, Italy reported 136 animals seropositive for equine infectious anemia, and Germany reported one confirmed case in a Warmblood horse.

A detailed report from South Africa provided information on equine fatalities that occurred in Western Cape Province between March and May 2007 involving approximately 20 deaths on 11 premises. The cause of death was attributable to infection with equine encephalosis virus Serotypes 1 (Bryanston) and 4 (Kaalplaas), not African horse sickness.

During July, equine viral arteritis was confirmed on 11 premises in France with non-Thoroughbred horses. Approximately 100 animals showed clinical signs, and seven stallions were identified as "shedders" of equine arteritis virus (EAV). Four foals died, and one abortion was confirmed following infection with EAV. Transmission had occurred through use of infected semen from four Percheron, two Normandy cobs, and an Arab stallion housed in the same facility at Haras du Pin National Stud, Orne.

Equine influenza was reported from Ireland on three premises and in Sweden, involving over 60 premises housing Thoroughbred and non-Thoroughbred racing and breeding horses. The United Kingdom reported influenza on eight premises, several of which had received animals from a sale in Ireland. A single Saddlebred horse farm in Central Kentucky, USA, also had influenza cases.

Lawsonia intercellularis was identified as the cause of illness among Thoroughbred animals on several farms in Western Cape Province, South Africa. Piroplasmosis was identified as the cause of illness among four Thoroughbred colts on a horse farm in Turkey. Strangles was widely reported on premises in Ireland, Sweden, Switzerland, and South Africa. Two equine cases of West Nile virus infection were reported at the end of June in California and Texas, USA. By the end of August, equine cases had been reported in 21 states.

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Equine Disease Quarterly

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