The only way that a gelding can infect another animal with EVA is if the gelding is in the active ("acute") stages of the infection, which lasts for only about 3 weeks. After he has gone through that stage, he will no longer be infectious. The virus ("EAV" - equine arteritis virus) is testosterone dependent for harbouring and shedding on a continuous basis - in other words, if there is no testosterone present, there will be no shedding (so no shedding with mares or geldings) unless the animal is in the acute stages of the disease, and no chance of permanent shedding at all.
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