Now bare with me :) MS is basically the immune system attacking the nervous system. HIV is a virus attacking the immune system. If you contract HIV and have your immune system eliminated. Your immune system than cannot attack your nervous system. Obviously this is a pretty barbaric way of fighting the disease of multiple sclerosis. It would be analogous of amputating an arm because of a broken finger. Wouldn't this perhaps be an interesting application for research to be done? Ofcoarse chances are that I'm likely quite incorrect on how it works.