Wisconsin mare’s strangles case highlights boarding biosecurity

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 Magazine. The mare had come from a rescue, adding another movement-linked case to a disease that spreads easily through direct horse-to-horse contact and contaminated equipment, water, or surfaces. A separate EDCC report published by Equus on March 13 said a 2-year-old Quarter Horse gelding in Marquette County, Michigan, also tested positive after developing bilateral nasal discharge on February 23; one additional horse there was suspected positive, and two had been exposed. Strangles is caused by Streptococcus equi subspecies equi and is considered highly contagious in equine populations. (equusmagazine.com)

Why it matters: For veterinarians and equine practices, the Wisconsin case is a reminder that intake history, rescue-origin horses, and boarding-facility traffic can all complicate exposure tracing and biosecurity. Wisconsin requires suspected reportable animal diseases to be reported to state or federal animal health officials, and DATCP points horse professionals to AAEP strangles guidance. AAEP describes strangles vaccination as risk-based rather than routine for every horse, which makes case-by-case prevention planning, isolation protocols, and communication with barns and pet parents especially important when a case appears. (datcp.wi.gov)

What to watch: Watch for any additional EDCC or state-level reports tied to Jefferson County contacts, quarantine measures at affected facilities, and whether linked exposure investigations identify more horses. (equusmagazine.com)