My good friends have a dairy herd, and now use Miracle-Mineral-Supplement exclusively to deal with calf scours, instead of costly meds from the vet. They use the formula Jim Humble recommends - I'll have to look it up, maybe john can find it quicker... - but they often found that one treatment did the trick. Granted, they were dealing with a bacterial issue, but a pathogen nonetheless. Miracle-Mineral-Supplement should do the trick - good luck.