Strangles (Streptococcus equi) has been confirmed in Grey County, Ontario. On December 5, 2025, a Standardbred mare developed a fever, became lethargic and anorexic prior to developing enlarged, firm submandibular lymph nodes which abscessed over December 13-14, 2025. The horse tested positive for S. equi by PCR and is now recovering. She is not involved in the racing industry. Two additional horses were exposed.
The farm owner, working with their veterinarian, has instituted voluntary animal movement restrictions and biosecurity protocols. To see past and present Strangles cases in Ontario go to: https://www.oahn.ca/resources/ontario-equine-disease-alerts/ and enter the disease surveillance portal.