I thought you might find this interesting Bob: an antigen from the eggs of parasitic worms seems to restrict the development of EAE in mice, though not if given after the onset of the disease:
J Neuroimmunol. 2008 Jan 18
Soluble egg antigen from Schistosoma japonicum modulates the progression of chronic progressive experimental autoimmune encephalomyelitis via Th2-shift response.
Zheng X, Hu X, Zhou G, Lu Z, Qiu W, Bao ...