Strangles is the colloquial name given to an infection caused by the bacterial organism Streptococcus equi. This bacterial infection invades the respiratory tract of horses, donkeys, and mules and causes swelling of the lymph nodes around the head and neck.
In some cases, the swelling around the pharynx might become so severe as to obstruct the airway; the audible respiratory effort and potential for suffocation spawned the name “strangles.”
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