2 Michigan Horses Test Positive for Strangles
The horses live in Oakland and Washtenaw counties.
Two horses in Michigan, located in Oakland and Washtenaw counties, recently tested positive for strangles.
Two horses in Michigan, located in Oakland and Washtenaw counties, recently tested positive for strangles. | Adobe Stock

Two horses in Michigan recently tested positive for strangles. The horses live in Oakland and Washtenaw counties. 

In Oakland County, a 2-year-old Welsh cross filly tested positive on June 16 after developing clinical signs on June 8, including throat latch swelling. She is under quarantine. 

In Washtenaw County, an 18-year-old Thoroughbred gelding tested positive on June 17 after presenting with a ruptured lymph node on June 13. He is under quarantine, and 16 horses are exposed.

EDCC Health Watch is an Equine Network marketing program that utilizes information from the Equine Disease Communication Center (EDCC) to create and disseminate verified equine disease reports. The EDCC is an independent nonprofit organization that is supported by industry donations in order to provide open access to infectious disease information.

About Strangles

Strangles in horses is an infection caused by Streptococcus equi subspecies equi and spread through direct contact with other equids or contaminated surfaces. Horses that aren’t showing clinical signs can harbor and spread the bacteria, and recovered horses remain contagious for at least six weeks, with the potential to cause outbreaks long-term.

Infected horses can exhibit a variety of clinical signs:

  • Fever
  • Swollen and/or abscessed lymph nodes
  • Nasal discharge
  • Coughing or wheezing
  • Muscle swelling
  • Difficulty swallowing

Veterinarians diagnose horses using polymerase chain reaction (PCR) testing with either a nasal swab, wash, or an abscess sample, and they treat most cases based on clinical signs, implementing antibiotics for severe cases. Overuse of antibiotics can prevent an infected horse from developing immunity. Most horses make a full recovery in three to four weeks.

A vaccine is available but not always effective. Biosecurity measures of quarantining new horses at a facility and maintaining high standards of hygiene and disinfecting surfaces can help lower the risk of outbreak or contain one when it occurs.

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