3 Michigan Horses Positive for Strangles

The horses live in Ottawa County, where 31 horses are exposed.
Three horses in Ottawa County, Michigan, are positive for strangles, and 31 horses are potentially exposed.
Three horses in Ottawa County, Michigan, are positive for strangles, and 31 horses are potentially exposed. | Wikimedia Commons

Three horses in Ottawa County, Michigan, were confirmed positive for strangles on March 13 after developing clinical signs in February. The affected horses include a 9-year-old Quarter Horse gelding, 2-year-old Quarter Horse filly, and 8-year-old Quarter Horse gelding. They are under quarantine, and 31 horses are potentially 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.

Brought to you by Boehringer Ingelheim, The Art of the Horse
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