International Equine Disease Report, Third Quarter 2013

The International Collating Center, Newmarket, England, and other sources reported the following equine disease outbreaks for the third quarter* of 2013.

Contagious equine metritis (Taylorella equigenitalis) was reported from Germany in one mare and one stallion on separate premises.

Australia, France, Ireland, Sweden, the United Kingdom, and the United States reported outbreaks of strangles. Several outbreaks were diagnosed in New South Wales, Australia. France and Ireland confirmed seven outbreaks each, either in Thoroughbreds or Standardbreds. Sweden and the United States reported that strangles was endemic, with several outbreaks diagnosed. Two outbreaks were recorded in the UK, one involving a non-Thoroughbred and the other a gelding with a concurrent infection of equine herpesvirus (EHV)-1.

Equine influenza was reported by Germany, Sweden, and the UK. A single case in a Thoroughbred was confirmed in Germany. Outbreaks involving Standardbred trotters and a pony were recorded on separate premises in Sweden, one of which was a racetrack. The UK confirmed at least eight outbreaks of equine influenza in as many counties, the vast majority involving unvaccinated horses. The clinical severity of disease varied significantly among affected horses.

Equine arteritis virus was isolated from the semen of a carrier stallion in France.

EHV-1 and -4 related diseases were reported by France, Germany, Ireland, the UK, and the United States. EHV-1 respiratory disease was confirmed in Germany (one outbreak), the UK (two outbreaks involving donkeys), and the United States (several outbreaks involving a number of states). Ireland reported EHV-1 related abortion in one mare and deaths of two neonatal foals, all Thoroughbreds. Equine herpesvirus-1 neurologic disease was confirmed in France (a single case in a vaccinated Thoroughbred) and the UK (two outbreaks involving several cases in both Thoroughbred and non-Thoroughbred mares). EHV-4 was associated with respiratory disease in France (eight outbreaks), Germany (one outbreak), and the UK (isolated cases on three premises, with one concurrent case of strangles). Numerous cases of infection with EHV-2 were reported by the United States, which also confirmed a single case of EHV-5 infection.

Reports of equine piroplasmosis were received from France (endemic), United Arab Emirates (endemic, sporadic clinical cases), and the United States. The United States reported that 231,664 horses had been tested since November 2009, of which 215 were positive either for Theileria equi (205) or Babesia caballi (10). Any recently discovered cases were in Quarter Horses competing in non-sanctioned racing in Texas.

Outbreaks of salmonellosis were reported by the United States where the disease is considered endemic. Four outbreaks involved untyped Salmonella spp; seven additional outbreaks involved Group B salmonellae.

Two outbreaks of rotavirus infection were confirmed in French trotters in France.

Australia (New South Wales) and the United States diagnosed a limited number of Lawsonia intracellularis infections.

Equine monocytic ehrlichiosis was recorded in Switzerland (one case) and the United States, with cases in Florida (one), Kentucky (39), Pennsylvania (one), and Virginia (six).

Several cases of clostridial enteritis in foals due to Clostridium perfringens type A were confirmed in the United States.

A single case of hendra virus infection and two cases of bat lyssa virus infection were recorded in Queensland, Australia.

The United States confirmed 135 cases of Eastern equine encephalomyelitis involving 22 states. The greatest number of cases were reported in South Carolina, Florida, Georgia, North Carolina, and Mississippi.

West Nile virus encephalitis was recorded in Italy and the United States. Italy confirmed 26 outbreaks involving 232 horses of which 10 were clinically affected with one death. The total number of cases in the United States during the period under review was 172. These occurred in 36 states, of which Montana, Wyoming, California, Texas, and Missouri had the largest number of cases.

*Second Quarter Report for Australia

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

About the Author

Equine Disease Quarterly

Stay on top of the most recent Horse Health news with FREE weekly newsletters from Learn More