Wisconsin strangles case highlights boarding barn biosecurity risk

A 21-year-old Trakehner mare at a boarding facility in Jefferson County, Wisconsin, tested positive for strangles on January 20, 2026, according to an EDCC Health Watch report published by Equus. The mare had decreased appetite, fever, pharyngeal swelling, and mandibular lymph node abscessation, and 40 additional horses were reported exposed. A separate EDCC Health Watch report published by EquiManagement said a 2-year-old Quarter Horse gelding in Marquette County, Michigan, tested positive on March 5, 2026, after developing bilateral nasal discharge on February 23; one additional horse was suspected positive, and two horses were exposed. Both reports trace back to the Equine Disease Communication Center, which posts verified outbreak alerts from state animal health officials. (equusmagazine.com)

Why it matters: For equine veterinarians and practice teams, these cases are a reminder that strangles remains a routine but disruptive biosecurity threat, especially in boarding, rescue, and commingled populations. The disease is caused by Streptococcus equi subsp. equi and spreads through direct horse-to-horse contact and contaminated surfaces. In Wisconsin, animal disease reporting is required for suspected reportable diseases, and in Michigan, strangles is listed as a regulated equine disease that must be reported within 24 hours. Guidance from AAEP and Cornell also underscores that clinically recovered horses can remain silent carriers in the guttural pouches, which is why follow-up testing and movement controls matter as much as the initial diagnosis. (equinediseasecc.org)

What to watch: Watch for whether either facility reports additional confirmed horses, quarantine changes, or clearance testing results before exposed horses return to normal movement. (equinediseasecc.org)