[REVISION HISTORY]

US equine strangles outbreak 2026

Updated 2 times since CLSTR started tracking revisions of this situation.

What changed

2026-07-29 20:08 UTC → 2026-07-29 21:00 UTC · added ~~removed~~

The outbreak of Streptococcus equi‑caused strangles in the United States continued through July 2026. After Wisconsin reported four new cases on July 20 and Florida confirmed an 18th state case on July 27, the Wisconsin Department of Agriculture added two more positive horses on July 29—a 20‑year‑old Paint mare in Dunn County and a 2‑year‑old Friesian mare at a boarding facility in Portage County. All affected animals were placed under quarantine and received supportive care, with biosecurity protocols reinforced at the respective farms. The July 29 bulletin also noted two cases of Potomac horse fever at a Green County boarding facility, an unrelated equine disease transmitted by insects or contaminated water. ~~Together,~~ In the same week, Michigan officials confirmed a Quarter Horse gelding in Kalamazoo County positive for strangles after PCR testing of a nasal swab. The horse, which showed nasal discharge and facial swelling on June 11, is now recovering, and nine additional horses on the premises have been identified as exposed. State authorities have placed the premises under quarantine and reiterated recommendations for strict hygiene and movement restrictions. Together, these reports show a pattern of geographically dispersed strangles incidents across the Midwest and Southeast, prompting state agriculture agencies and the Equine Disease Communication Center to monitor, isolate, and advise on heightened ~~hygiene and movement restrictions~~ biosecurity measures to contain the spread.

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