No it won’t. Past EPM is undetectable.
I’d agree with just letting a future vet exam carry the news if I knew a past EPM was something that would be obvious on every future vet exam. But it is invisible.
Unless someone thinks there is a reason to pull an antibody test, which around here is $250. Even then the antibodies may not remain strong after some number of months. It’s just not something any vet suggests on a routine exam or a PPE of a horse with no symptoms.
A horse may be moved along out of a training program because of an EPM history. The owner/trainer doesn’t want a horse that is sometimes good to go but sometimes not. But unless the seller discloses, the next buyer has no way of knowing an asymptomatic horse has a past history of EPM.
Even if the horse shows signs of another round of EPM, the past history still won’t be diagnosable. The owner is likely to think this is the first time. Vets and owners are likely to make different decisions if a horse is having repeat EPM vs. first-time EPM.
And a severe case can cause ramifications down the line if there was permanent damage, but an owner who doesn’t know won’t be looking for that. The next vet will have no way of knowing, either. A horse has to be pretty definitely symptomatic before people starting thinking ‘EPM’. And even then there are other potential causes of those symptoms so EPM may not be the first guess - unless we know there is a history. That’s the problem with non-disclosure.
And once a horse has had it once, it can reoccur, although it doesn’t always. Sometimes it is hard to clear EPM even if the horse seems to be recovered. It’s not immediately obvious that EPM is the symptom cause unless we know there is a history.
This is the crux of the issue with disclosure.
Agree with that. No reason to push.
New owner may already know what this is about.