Testing strategy is not up to par as the mainstream likes to use for the detection of lyme and tick borne diseases. I was myself tested with Elisa test and returned a positive test then it was backed up with a western blot test which both tests were sent to a not lyme knowledgeable testing lab. The western blot came back negative and there by the doctor through it out and said I tested negative for lyme. These tests are basically useless after you have been treated with antibiotics for any number of issues such as sinus which was one of my first troubling issues with lyme. After a time a lyme literate doctor would have your blood test overnight ed to California for a special lyme test that will be more accurate and then it is not always 100%. Often you are clinically diagnosed and then put on antibiotics for a time and when this has results. It is most likely the right diagnosis. I remember often during one of my many sinus attacks I would feel much better for a few weeks and then I would be right back again for more antibiotics. This should have been a signal. But then there were not the literary ramblings of lyme sufferers and tick related disease sufferers around to put a pattern together.