Parasitic causes

Someone suggested Schistosomiasis, a parasitic infection, as a possible cause of my kidney insufficiency (due to the antibodies that the immune system produces to attack the parasite), and reading about it, it is plausible.

http://renalfellow.blogspot.com/2009/02/schistosomiasis-and-renal-disease.html

In any case, this study suggests that anti-parasitic medicine is ineffective at preventing the progression of chronic kidney disease:

http://www.nature.com/ki/journal/v35/n5/abs/ki1989114a.html

Also, I think the fact that my immune system tests were negative (no antibodies in my blood) means that the cause is of my condition is not due to something external to the kidneys.