Great article. Note that the final diagnosis if the horse is suspect is a blood test and a spinal fluid test. Without these tests you won't know for sure. I had a horse diagnosed by two trainers and two vets as a EPM horse. I didn't believe them but took her to Ohio state for the test. Test showed 100% chance that she did NOT have EPM. Someday I will tell you the rest of the story about quakery.