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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.
Nasal secretions are assumed to be the source of S. equi in these animals. A horse just recovering from strangles may have prolonged shedding of S. equi. These horses are known as long-term sub-clinical carriers of S. equi, and can be the source of infection for naive naÃ¯ve. horsest can survive for long periods of time out of the body and horses can become infected with the bacteria months after an infection had been noted an a specific property. The bacteria is transmitted by inhalation of dust and respiratory secre-tions that contain the organism.