I just had an Igenex Lyme test that came back negative. I was kind of surprised since I've had a recurring rash where I was bitten by a tick. The doctor thinks I likely have bartonella due my symptoms. I know it's possible to have Bartonella without borrelia burgdorferi. I do think there's another possibility. I've been taking the herbs in Stephen Buhner's Lyme protocol for about the past 10 months. Most of the herbs modulate the immune system. My doctor didn't want me to start LDN until after my Lyme test because he said it could skew the results due to its effect on the immune system. I wonder if maybe the herbs in the protocol worked the same way.