How is a positive diagnosis made? Or do you just treat based on symptoms and assumptions that your horse has NTW's? I've got a VERY itchy gelding who last year, opened a 6 inch gash on his sheath from trying to scratch himself on a pine tree. He! turns into a huge open, oozing, itchy sore from his chin, all the way along his ventral midline to his tail. He's in a fly sheet and on a high flax diet this year and there is improvement, but he's still got some oozy sores on his chest. He's the DEVIL to deworm, but to keep him comfortable, I'll try anything!
I read the COTH thread when it was first written (and honestly didn't keep up w/ it when it went over 50 pages!), I know it was discussed that Equimax was the "dewormer of choice" at that time, has it been confirmed that plain Ivermectin was just as effective?