If you and/or your cousin have not looked into some of the work of Garth L. Nicolson, PhD, he speaks and writes about
chronic infections being implicated in a variety of conditions like Lyme Disease, ALS, MS, Lupus, and others.Rheumatoid Arthritis, Multiple Sclerosis, Lupus, Inflammatory Bowel Diseases, Scleroderma and other Autoimmune and Degenerative Diseaseshttp://www.immed.org/illness/autoimmune_illness_research.html
It's not the greatest website, with regard to visual appeal and navigation, but if you spend some time clicking-around, you may find stuff that's useful -- or, that might direct you to other resources.
Also...Episode #63: Mycoplasma with Dr. Garth Nicolson, PhDhttp://www.betterhealthguy.com/episode63https://www.youtube.com/watch?v=67-bqls4zi4
Finally, play around with Google, searching for terms like:
"Garth Nicolson" AND "MS"
"Garth Nicolson" AND "Multiple Sclerosis"
"Garth Nicolson" AND "Lyme"
"Garth Nicolson" AND "Autoimmune"
"Garth Nicolson" AND "Podcast"
"Garth Nicolson" AND "Interview"
Using the quotes and the boolean operator AND should help return more relevant searches.
I wish you, your cousin, and your cousin's friend much luck.