The International Collating Center in Newmarket, England, and other sources reported the following disease outbreaks in the third quarter of 2012*:
Contagious equine metritis was reported from Germany. Infection with the causal bacteria, Taylorella equigenitalis, was confirmed in non Thoroughbreds: two stallions and three mares on one premises and a stallion on a second premises.
One case of equine coital exanthema (equine herpesvirus-3) was diagnosed in Kentucky, USA.
Strangles was recorded in Germany, Ireland, Switzerland, and the USA. Ten cases were reported from Ireland. Outbreaks involving 17 horses on two premises occurred in Switzerland. Single cases and outbreaks of strangles were reported from Maine, Kentucky, and Pennsylvania in the USA, where the disease is endemic.
Outbreaks of equine influenza were reported from Argentina, the UK, and the USA. The disease was confirmed at three thoroughbred racetracks in Buenos Aires; the virus was a strain of Florida, clade 1 sublineage. The UK diagnosed influenza on two premises. Several cases of influenza were confirmed in Kentucky and Wisconsin in the USA.
Equine herpesvirus (EHV)-related diseases were reported from Argentina, France, the UK, and the USA. Argentina reported five cases of EHV-1 abortion (non-neuropathogenic strains) in 2 of 10 non-vaccinated Thoroughbreds and 3 of 70 vaccinated Thoroughbreds. In France, EHV-1 and -4 were implicated in a respiratory outbreak in thoroughbreds at a training center; also reported was a single case of EHV-1 neurologic disease. The UK noted outbreaks of EHV-4 respiratory disease on 10 premises and one case of EHV-1 neurologic disease. EHV respiratory disease was also reported in the USA. Several cases of infection with EHV-2 or -5 were diagnosed in California, Kentucky, and Ohio in the USA.
Ireland reported cases of Pneumocystis carinii infection in a group of foals.
Equine infectious anemia (EIA) was confirmed in Canada, France, Germany, and the UK. Single cases were diagnosed on two premises in Alberta and one in the Yukon. France reported the infection in three Carmargue horses. Germany reported several outbreaks: four in one state, two in another, and single premises in two other states. The index case on one premises was in a foal that received plasma therapy; the donor mare was positive. Upon investigation, six other plasma recipients were found to be EIA positive.
Equine piroplasmosis was reported from France (endemic), Spain (endemic), Switzerland, United Arab Emirates (endemic), and the USA. Switzerland confirmed one case based on clinical evidence and serologic findings. The USA reported testing more than 190,000 horses since November 2009; no new cases of infection were detected in the third quarter.
In the USA, the number of equine cases of Eastern equine encephalomyelitis during the third quarter was 35; the national total is 171 cases in 2012. The number of affected states went from 6 to 16 with the greatest increase in disease cases confirmed in Louisiana, Mississippi, North Carolina, and Alabama. The number of equine cases of West Nile encephalitis rose dramatically in the third quarter in the USA; a total of 427 cases were reported from 40 states, with maximal increases in Texas, Pennsylvania, California, Indiana, and Iowa. Single cases of Hendra virus infection were confirmed on three premises in Queensland, Australia, all fatal.
Vesicular stomatitis infection (New Jersey strain) was diagnosed in 25 equine (on 18 premises) in New Mexico and Colorado. Salmonellosis was reported by Ireland (three cases) and the USA. S. agona and Salmonella spp. belonging to Groups B, C1, and C2 were involved.
Argentina recorded limited outbreaks of rotavirus Group A infection in foals. Equine monocytic ehrlichiosis was reported in the USA, with multiple cases diagnosed in Ohio and Kentucky.
An isolated case of Anaplasma phagocytophilum infection was recorded in Switzerland.
*Second Quarter Report for Australia
Published in Gluck’s Equine Disease Quarterly, which is funded by Lloyd’s, London, brokers, and their Kentucky agents.