I guess I will show my stupidity here and ask if there is a difference between coccidia and coccidiosis as it seems that you are talking about 2 different things.....and I could be nuts too (BG). I have heard that all pups have the bacteria and stress helps to bring it out.
I had a problem for several years....we pulled pups at 14 days and they did fine for a week to 10 days. Then, the stools turned a watery yellow with white chunks that looked like cottage cheese and a few days later there would also be blood. I would take samples into the vet and they tested neg. for coccidia but we always put them on Albon just to be safe. Finally, the vet asked about my formula and it did contain the yolk of raw eggs. He told me to pull the raw egg yolks as he felt that they could not digest raw eggs at this young age. This seems to have solved the problem. If there is any diarrhea at all, I have gotten a drug called SMZ which is a pink liquid and clears it up in less than 24 hours.