The International Collating Centre, Newmarket, United Kingdom, and other sources reported the following equine infectious disease outbreaks.

Isolated cases of African horse sickness (AHS) were recorded in South Africa. The disease was confirmed in the Eastern Cape, Free State, and Gauteng Provinces, all within the AHS infected area of the country.

Turkey confirmed one case of glanders during routine screening.

The United States reported nine outbreaks of equine influenza in four states, with multiple cases occurring in Texas. One outbreak was also confirmed in the United Kingdom.

France, Germany, South Africa, Switzerland, the United Kingdom, and the United States recorded strangles outbreaks. The number of confirmed disease events ranged from 11 in France, three in Germany, sporadic occurrence in South Africa, three in Switzerland, endemic in the United Kingdom, and the United States with outbreaks reported in 12 states.

Equine herpesvirus-1 (EHV-1)-related diseases were reported by France, Germany, Ireland, Japan, South Africa, and the United States. Respiratory disease was recorded in Ireland (five cases), Japan (one outbreak), South Africa (two cases), and the United States (widespread in various states). Abortion was confirmed by France (two cases), Germany (two cases), Japan (single cases on five premises), and the United States (two cases). Neurologic disease was diagnosed in France (three outbreaks, each involving a single case of the disease), Germany (one case), and the United States (single outbreaks in seven states; seven cases in one outbreak associated with a G2254 strain of the virus).

France (18 outbreaks), Switzerland (one case), and the United Kingdom (three outbreaks) reported respiratory illness associated with equine herpesvirus-4 infection. The United States diagnosed a single case of abortion.

Equine herpesvirus-2 and/or -5 infection was recorded in several states in the United States, sometimes associated with evidence of respiratory disease.

Canada (four cases in Alberta and one in Quebec), France (single case), and the United States (one case in Tennessee, two in Kansas, and multiple cases in Montana), confirmed occurrences of equine infectious anemia in the fourth quarter of 2017.

Equine piroplasmosis was reported to be endemic in France and in South Africa, with 27 cases diagnosed in six of the nine provinces.

France, Germany, and South Korea recorded cases of contagious equine metritis. A yearling filly without any breeding history was found positive on a pre-export test in France. Two cases were diagnosed in Germany, and South Korea detected 22 positives among 2,165 samples tested without specifying in which quarter they were identified.

Eight cases of leptospiral abortion were diagnosed in Kentucky.

The United States reported 10 cases of serogroup B Salmonellae in Kentucky.

One case of equine neorickettsiosis was recorded in Washington.

Rotaviral enteritis was confirmed in Argentina (two outbreaks in 2-month-old Thoroughbred foals on separate premises) and France (a single case).

The United States reported cases of proliferative enteropathy caused by Lawsonia intracellularis in Kentucky (10 cases) and Pennsylvania (one case).

Clostridial enteritis/enterocolitis due to Clostridium perfringens Type C toxin was linked to six cases of disease in Kentucky.

The United States confirmed 30 cases of Eastern equine encephalomyelitis in the fourth quarter of 2017, 12 of which were diagnosed in Wisconsin.

The United States reported 103 cases of West Nile virus across numerous states, with New York and Utah each responsible for 26 cases.

Rhodococcal-related disease is endemic in the United States, with eight cases confirmed during the review period.

Infection with Corynebacterium pseudotuberculosis, the cause of pigeon fever, is endemic in the United States; a single case was diagnosed in Washington.


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