Posted on Wednesday, September 06, 2006 - 11:57 pm:
There is a discussion about EVA to be found on this board by following that link which will provide more details.
EVA is typically transmitted via a respiratory route or in semen. It is not genetically transmissable. It is only infectious in the active clinical stages infectious stages in all horses, and via semen transmission in the stallion. It is testosterone-dependent for harbouring and shedding in the male, so a colt that does not yet have elevated testosterone levels will not be able to harbour the virus.
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