My 15 yr old son with swollen glands, rash (not EM) and stiff knees and back lyme test came back elisa posit. (bands 41 & 58), wb neg (41) but titers high (1.67). Are there other reasons titers would be high if you don't have lymes? This stuff is so confusing. All drs. convinced he doesn't have lymes but redoing blood next week. Any comments.