Wisconsin strangles case highlights ongoing barn biosecurity risk

Wisconsin has a new confirmed strangles case in a mare in Waupaca County, according to an EDCC Health Watch report published by Equus on February 6, 2026. The 15-year-old Paint mare tested positive on November 6, 2025, after developing clinical signs on October 31, and she has since recovered. Three additional horses at the facility were also considered likely infected, though they were only mildly affected and responded to treatment. The report was based on information from the Wisconsin Department of Agriculture, Trade and Consumer Protection via the Equine Disease Communication Center. Separately, Equus also reported another Wisconsin strangles case published March 23 involving a 15-year-old Quarter Horse mare in Jefferson County that developed nasal discharge on March 6, tested positive after exposure at a previous rescue premises, and was placed under quarantine. (equusmagazine.com)

Why it matters: For equine veterinarians and barn managers, the cases are a reminder that strangles can extend beyond the index horse, present with variable severity across a group, and follow horses moving through rescue or rehoming settings. AAEP guidance notes that Streptococcus equi spreads through direct contact and contaminated equipment, and that horses without obvious signs can still contribute to transmission. The guidance also recommends separating horses into clean, exposed, and sick groups during an outbreak, isolating febrile animals promptly, and recognizing that horses may remain infective for up to six weeks after clinical signs resolve unless testing shows otherwise. Common signs include fever, nasal discharge, coughing, swollen or abscessed lymph nodes, muscle swelling, and difficulty swallowing; diagnosis is typically made by PCR on a nasal swab, wash, or abscess sample. (aaep.org)

What to watch: Watch for any additional Wisconsin alerts tied to exposed horses, especially in facilities taking in horses from outside premises, as well as whether barns tighten quarantine, testing, hygiene, and intake protocols for new arrivals. Most horses recover in three to four weeks, but recovered horses can continue shedding long enough to prolong outbreak management. (equusmagazine.com)