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Immunity. After developing strangles, most horses eliminate infection fairly rapidly (i.e., within 30 days after recovery). Approximately 75% of horses develop a solid enduring immunity to strangles following recovery from the disease.
Complications of Strangles. 1  Post strangles myocarditis (inflammation of heart muscle), which may follow strangles in a small proportion of horses. 2  Purulent cellulitis (inflammation of the subcutaneous tissue), which is an unusual occurrence where infection spreads locally in the subcutaneous tissue to the head.