The International Collating Center, in Newmarket, United Kingdom, and other sources reported the following equine disease outbreaks for the second quarter of 2017.

Outbreaks of African horse sickness were reported in all provinces in South Africa except the Western Cape. Occurrence was as expected for this time of the year.

Equine influenza was reported in the United Kingdom and the United States. The United Kingdom confirmed two outbreaks. Influenza was recorded in 14 states in the United States, where it is considered endemic.

France, Germany, South Africa, Switzerland, and the United States recorded outbreaks of strangles. The number of confirmed outbreaks includes three in Switzerland, four in Germany, and 16 in France. Whereas the disease was reported as sporadic in South Africa, it is considered endemic in the United States. High clinical attack rates were seen in ponies and horses on a premises in one Western state and in corralled wild horses in two states.

Equine herpesvirus-1 (EHV-1) related diseases were reported by France, Germany, Ireland, Japan, Switzerland, the United Kingdom, and the United States. Fever with or without respiratory disease was confirmed on two premises in France. Ireland reported four cases of infection. Germany, Switzerland, and the United Kingdom recorded one or two outbreaks and the United States reported that the disease was present in various states.

Cases of abortion were diagnosed in France (two outbreaks), Germany (three outbreaks), Japan (10 outbreaks), the United Kingdom (two outbreaks), and the United States (one outbreak). EHV-1-related neurologic disease was recorded in France (one case), the United Kingdom (isolated cases on two premises), and the United States (four outbreaks on facilities in California, Colorado, Maryland, and New Jersey, each involving a single case of the disease).

Equine herpesvirus-4 was reported in France, Germany, Ireland, and the United Kingdom. The number of outbreaks varied from one in Ireland, three in Germany, four in the United Kingdom, and 14 in France.

The United States recorded multiple cases of equine herpesvirus-2 and/or -5 infection, some associated with respiratory disease, in several states.

Equine infectious anemia was confirmed in Germany, Switzerland, and the United States. The disease was identified on three premises in Germany, one in Switzerland, and two in the United States, both epidemiologically linked, with three cases on each premises.

France and Switzerland reported the presence of equine piroplasmosis. France considered the infection endemic and Switzerland recorded a single case of the disease.

Contagious equine metritis was diagnosed in Germany. Ten Icelandic stallions and five mares on a total of 13 premises tested positive.

France diagnosed a case of equine coital exanthema (equine herpesvirus-3) on two premises as well as one case of leptospiral abortion.

Nocardioform placentitis was confirmed in Kentucky, with five cases caused by Amycolatopsis spp and two by Crossiella equi.

Twenty-three cases of salmonellosis were reported by the United States during the second quarter of 2017; reported serogroups included B (15), C1 (2), and C2 (6).

The United States confirmed three cases of Clostridium perfringens Type A genotype in foals in Kentucky, one case of Tyzzer’s disease (C. piliforme), and isolated cases of C. novyi and C. sordelli infection.

Three outbreaks of rotaviral diarrhea were recorded in France.

The United States reported a case of proliferative enteropathy (Lawsonia intracellularis) in a foal.

Rhodococcal related disease was reported as endemic in the United States, with 22 cases recorded during the review period.

Switzerland diagnosed two cases of atypical myopathy and four cases of ehrlichiosis, the latter involving three premises.

West Nile encephalitis was reported by South Africa (44 cases, lineage 2 virus) and the United States (one case). Five of the cases in South Africa represented co-infection with equine encephalosis virus and three others with Middleburg virus.

Equine encephalosis was reported by South Africa and confirmed mostly in Gauteng Province. Encephalitis due to Middleburg virus was reported across South Africa with 41 confirmed cases, two of which were co-infections with equine encephalosis virus.


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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