The International Collating Center, Newmarket, United Kingdom, and other sources reported the following disease outbreaks, as reported in the latest issue of Equine Disease Quarterly, 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 UK, and the US 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 USA 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-1 (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.
- Equine herpesvirus-1 and -4 related diseases were reported by France, Germany, Ireland, the UK, and the USA. Equine herpesvirus-1 respiratory disease was confirmed in Germany (one outbreak), the UK (two outbreaks involving donkeys), and the USA (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). Equine herpesvirus-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 equine herpesvirus-2 were reported by the USA, which also confirmed a single case of equine herpesvirus-5 infection.
- Reports of equine piroplasmosis were received from France (endemic), United Arab Emirates (endemic, sporadic clinical cases), and the US. The US 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 USA 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 US diagnosed a limited number of Lawsonia intracellularis infections.
- Equine monocytic ehrlichiosis was recorded in Switzerland (one case) and the USA, 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 USA.
- A single case of Hendra virus infection and two cases of bat lyssa virus infection were recorded in Queensland, Australia.
- The USA 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 USA. Italy confirmed 26 outbreaks involving 232 horses of which 10 were clinically affected with one death. The total number of cases in the USA 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 figured were reported for Australia
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