The International Collating Center, in Newmarket, U.K., and other sources reported the following disease outbreaks for the third quarter of 2015.

Vesicular stomatitis (New Jersey serotype) was reported in the United States, with 192 virus-confirmed outbreaks in eight states: Arizona, Colorado, Nebraska, New Mexico, South Dakota, Texas, Utah, and Wyoming. Disease was additionally identified on 335 premises based on clinical signs.

Influenza was reported by France, the United Kingdom, and the United States. Two cases were involved in a single outbreak in France. The United Kingdom confirmed three outbreaks: single cases on two premises and several affected animals on a third premises. All cases involved unvaccinated horses or ponies. Influenza was reported as endemic in the United States with outbreaks confirmed in five states.

Equine herpesvirus-1 and -4 (EHV-1 and -4) related diseases were recorded in Argentina, France, Germany, Ireland, the United Kingdom, and the United States. EHV-1 associated respiratory disease was diagnosed in Germany (isolated cases), Ireland (single case), the United Kingdom (single case co-infected with strangles), and the United States (several states). EHV-1 abortions were reported by Argentina, France, the United Kingdom, and the United States. Two outbreaks were identified in France involving Thoroughbreds and French Trotters, and single cases were confirmed in Argentina, the United Kingdom, and the United States. One case of EHV-1 myeloencephalopathy (neurologic disease) was recorded in France. Outbreaks of EHV-4 respiratory disease were confirmed in France (11 outbreaks) and Germany (three outbreaks).

Strangles was recorded in France (13 outbreaks), Germany (five premises), Ireland (21 cases in four provinces), Switzerland (three outbreaks), and the United Kingdom (one outbreak). Strangles was reported as endemic in the United States with disease confirmed on 18 premises in 11 states.

Switzerland reported a single case of EHV-5 co-infection with Theileria equi. Multiple cases of either EHV-2 or EHV-5 were confirmed in the United States.

Equine arteritis virus infection was reported in a Warmblood stallion in Germany.

Canada confirmed 41 cases of equine infectious anemia in four Western provinces, the majority in Saskatchewan and Alberta.

Equine piroplasmosis was reported as endemic in France.

Germany and South Korea confirmed outbreaks of contagious equine metritis. Germany recorded outbreaks involving 19 non-Thoroughbreds on four premises, one of which involved two stallions and 14 mares on an Icelandic horse farm. Seventy-one positive Thoroughbreds on 36 premises were identified in South Korea.

One case of coital exanthema (EHV-3 infection) was diagnosed in the United States. The United States also reported two cases of nocardioform placentitis, both associated with Amycolatopsis spp.

Salmonellosis was recorded in Germany (one case), Ireland (one case), and the United States (several outbreaks involving Group B and C1 Salmonella spp).

The United States diagnosed proliferative enteropathy due to Lawsonia intracellularis in two foals. Outbreaks of rotavirus infection were reported in France (two outbreaks) and Germany (one case). Two cases of clostridial enteritis associated with C. perfringens Type A toxin were identified in the United States.

Thirty-six cases of Eastern equine encephalomyelitis (EEE) were diagnosed in eight states in the United States, with Florida and Texas having the most numerous cases. The vast majority of EEE cases were in unvaccinated horses.

West Nile virus infection was reported in France and the United States. Thirty cases were confirmed in France; all but one occurred in two geographic areas. The United States reported 58 cases, with the greatest numbers in Texas, Washington, and Colorado, nearly all in unvaccinated horses. Switzerland confirmed two cases of tick-borne encephalitis.

A Getah virus outbreak was reported in Japan involving 25 Thoroughbred horses on one premises. The majority of cases occurred in 2 year olds, 10 of which had not been vaccinated.

Rhodococcal disease was reported as endemic in the United States, with numerous outbreaks in various states.

Single cases of the following diseases were reported during the third quarter of 2015: ehrlichiosis and borreliosis (Switzerland); and anthrax, neorickettsiosis, and pythiosis (the United States).


This is an excerpt from Equine Disease Quarterly, funded by underwriters at Lloyd’s, London.

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Equine Disease Quarterly

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