Wisconsin strangles case highlights ongoing biosecurity gaps
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A Wisconsin mare in Waupaca County tested positive for strangles, according to an EDCC Health Watch report published by Equus on February 6, 2026. The 15-year-old Paint mare developed clinical signs on October 31, 2025, was confirmed positive on November 6, and has since recovered. Three additional horses at the facility were also considered likely infected, though they were reportedly only mildly ill and responded to treatment. The alert was tied to data from the Wisconsin Department of Agriculture, Trade and Consumer Protection and categorized as a voluntary quarantine. A separate Equus EDCC Health Watch item also described a 15-year-old Quarter Horse mare in Jefferson County, Wisconsin, that tested positive on March 23 after developing nasal discharge on March 6; that mare had come from a local rescue, had been exposed at her previous premises, and was placed under quarantine. (equusmagazine.com)
Why it matters: For equine veterinarians and other horse health professionals, the case is a reminder that strangles can extend beyond a single clinically obvious horse and may include mildly affected in-contact animals. It also reinforces how often intake history and prior exposure matter, especially for horses arriving from rescues or other facilities. AAEP guidance notes that horses can continue shedding Streptococcus equi after apparent recovery, and that without testing, they should be considered potentially infective for up to six weeks after clinical signs resolve. Horses without obvious signs can still harbor and spread the organism. AAEP also recommends separating horses into clean, exposed, and sick groups, monitoring temperatures twice daily, and using testing to identify persistent shedders. PCR testing can be performed on a nasal swab, wash, or abscess sample, and while most horses recover in three to four weeks, antibiotics are generally reserved for more severe cases. (aaep.org)
What to watch: Watch for any additional Wisconsin EDCC alerts, follow-up testing to rule out carrier horses, and whether facilities tighten quarantine, hygiene, surface disinfection, and intake protocols for new arrivals. The related Michigan EDCC report also involved a recovering 2-year-old Quarter Horse gelding with one additional horse suspected positive and two exposed, underscoring the same pattern of limited confirmed cases with broader barn-level risk. (aaep.org)