For those that have a MS diagnosis (or like me, nearly had one), this is something that you may want to look into.
"A relation between brucellosis and multiple sclerosis has recently been postulated by Kyger and Haden. They reported a high incidence of cutaneous sensitivity to Brucella antigens in patients with the diagnosis of multiple sclerosis. In 118 patients, results of intradermal tests with killed Brucella organisms were reported as positive in 115. The possibility of multiple sclerosis being etiologically related to brucellosis was proposed largely on the basis of these findings."
jama.jamanetwork.com/article.aspx?articleid=295099