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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.
Tetanus and strangles â¢ Foals can be started on their vaccination course against both diseases at about 12 weeks of age. â¢ Protection for the first 12 weeks of life occurs if a. previously vaccinated mare is given another. booster at least 2â6 weeks before foaling.etanus This bacterial disease causes fatal tetany in about 80 per cent of infected horses. The organism Clostridium tetani, which causes the disease, lives in soil and manure. It enters the body through wounds. The bacteria multiply only in sites where there is a poor oxygen supply, such as in deep wounds.