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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.
The disease is caused by the bacteria Streptococcus equi, which infects the upper respiratory tract of equine species (horses, mules, zebras). The disease gets its name-strangles-from the swelling of the lymph nodes under the jowl and around the throat latch area, which can interfere with a horse's ability to breathe.Strangles can occur in any age horse, although horses between 1 and 5 years old are affected more frequently.The disease is highly contagious, with 50 percent or more of exposed animals becoming sick.trangles can occur in any age horse, although horses between 1 and 5 years old are affected more frequently. The disease is highly contagious, with 50 percent or more of exposed animals becoming sick.