oops i just breifly responded to ANA and obands in your other post, Lupus is probably the best MS mimic of all, both Lupus and Lyme are difficult to diagnose but ANA can be a false positive and it isn't just associated with those 2 conditions....
"ANAs can be produced in patients with infections (virus or bacteria), lung diseases (primary pulmonary fibrosis, pulmonary hypertension), gastrointestinal diseases (ulcerative colitis, Crohn's disease, primary biliary cirrhosis, alcoholic liver disease), hormonal diseases (Hashimoto's autoimmune thyroiditis, Grave's disease), blood diseases (idiopathic thrombocytopenic purpura, hemolytic anemia), cancers (melanoma, breast, lung, kidney, ovarian and others), skin diseases (psoriasis, pemphigus), as well as in the elderly and those people with a family history of rheumatic diseases."
http://www.medicinenet.com/antinuclear_antibody/page2.htm
Hope it helps.........JJ