The International Collating Centre, in Newmarket, United Kingdom, and other sources reported the following equine disease outbreaks during the third quarter of 2017.

Denmark, France, Germany, South Africa, Switzerland, and the United States reported occurrences of strangles. The number of recorded outbreaks varied from one in Denmark, 12 in France, seven in Germany, sporadic occurrences in South Africa, and two in Switzerland. The United States reported the disease as endemic. At least 33 outbreaks were confirmed in 13 states, with multiple cases diagnosed on affected premises in four states.

Influenza was reported by the United Kingdom (two outbreaks, both involving recently imported Irish Draft horses) and the United States (a single outbreak).

Germany, South Africa, and the United States recorded equine herpesvirus-1 (EHV-1) related diseases. EHV-1 respiratory infections were reported in various states in the United States. Cases of abortion were diagnosed in South Africa (two cases and one death in a neonatal foal) and the United States (isolated cases on four premises). Neurologic disease due to EHV-1 was recorded by Germany (one outbreak involving four horses) and the United States (two outbreaks in Virginia, one involving two cases and the other, four cases of the disease, two of which died or were euthanized)