Does anyone know? I'm talking about a single bulls-eye rash that developed to about the size of a dinner plate. My husband was tested for Lyme (neg.), and he took a couple of weeks of antibiotics. That was a year and a half ago. I think that he is showing signs of cognitive problems, and some fatigue as well and want him to be tested w/the Igenex or the other one as Quest tests keep coming back negative.