Help! Lost.2.Goats.to.Severe Diahrea, 3rd in Jepardy

[blackie's maiden]

We lost one.about mid March, second about April6, now.a third one showing same severe diahrea. These were all female, looked healthy and diahrea took them down in about 3 days. We are at loss and afraid it will eventually hit our pack goats. Any ideas? What do we do to treat? Should we treat whole herd?

I should add these are all very mature goats, even somewhat elderly but are still fat and healthy before.this happens so quick so hard to believe it could.be coccidiosis. I understood.that generally hits young goats.