Strangles is caused by a Strep bacterium which is discharged in the environment in pus drainage from nasal passages and draining abscesses of an infected horse. A susceptible horse can be exposed by either ingesting or inhaling the bacteria in the contaminated environment such as grass, feed, soil, or people’s hands. Transmission between horses can also occur by direct contact with infected horses. Young horses under two years of age are more susceptible to contracting the bacteria. Once the infected horses are removed from the environment, the environmental contamination disappears. When a horse recovers from the disease, it will have a long-lasting immunity.

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