cpn testing is unreliable as is Lyme testing and im sure testing for dozens.of other unknown pathogens, toxins, bacteria etc. That really only leaves us with always having to assume we are all subject to all the factors identified as possible causes/triggers of MS (cpn, lyme, mercury/root canals, hepatitis b shot, and a long etc in my case). Everyone believes more in ine or the other but it really is just faith in a self diagnostic because as you are all correctly stating there is no way to test accurately for any of these.
I got to admit that right now im leaning more and more towards Dr. Ciceros vitamind d protocol. its really not about identifying the cause of MS (I doubt anyone will ever achieve this) but about protecting the nervois system and helping the immume system.