Add another topic for me to learn about. I just discovered i am positive for DR4. I did a search on this at Lymenet but did not come up with anything really specific. My understanding is that if you test positive for this, then the odds are 50-50 that you will not respond to antibiotic treatment. (I am showing my ignorance yet again, i know.) Has anyone else had this test? If so, what types of treatments have you responded to? Please, all ideas welcome.