I am beginning to think this is nothing more than a money maker for vets and government bureaucracies. Seems horses that do test positive rarely are showing any symptoms. I know lots and lots of horses running around that have never been tested. Youd think if it was an issue more sick horses would be showing up. Of course they could be getting treated but not tested. Of course I guess it could be like smallpox and the large scale testing an euthanizing has pretty much eradicated the disease.
Under federal law if your horse tests positive you have three options, donate to science, ( the one place that accepts them is full) place in an approved quarrantine for life, or kill them. Most are killed. Seems there are a few positives every year. Usually makes headlines in the various horse magazines.