Most horses that develop strangles get it from infected nasal discharges of a horse with an active case of strangles or one that has recently recovered from it. Transmission may occur directly from horse to horse, or indirectly through people or shared equipment (feed and water buckets, tack, etc.). It is important to recognize that about 20% of horses continue to shed streptococcus equi in their nasal secretions for several weeks after they have recovered. An extremely small percent (1-10%) of horses may continue to shed streptococcus equi for prolonged periods of time (from months to years).