Helminthic Therapy
Helminthic therapy is the treatment of autoimmune diseases and immune disorders by deliberate infestation with a helminth or the ova of a helminth. Helminths are parasitic worms such as hookworms and whipworms.
“The Worm Turns”
http://www.nytimes.com/2008/06/29/magazine/29wwln-essay-t.html