You're talking about Coccidia...You can do a search on the net and find out about it...Here's a short description and a link for more reading.
http://www.marvistavet.com/html/body_coccidia.html Coccidia are microscopic parasites that live within cells of the intestinal lining. Because they live in the intestinal tract and commonly cause diarrhea, they are often confused with worms.
oops Chachi - we were posting at the same time...didn't mean to repeat you.
and Chachi is right - there are puppies out there who aren't sick and you may want to keep looking.....At least the breeder is treating the puppies ....but if the one you wanted has it - chances are they ALL have it at her facility/home and she knows all about it.