Well, I've found this much so far, let me know if you need more information. I have a doc's appt this afternoon, so I may be late in responding.
"Polymerase chain reaction (PCR) multiplies a key portion of DNA from the Lyme bacteria so that it can be detected. While PCR is highly accurate when the Lyme DNA is detected, it produces many false negatives."
www.lymedisease.org/lyme101/lyme_disease/lyme_diagnosis.html And it wouldn't matter what country you test in if the tests can't detect the bacteria during all phases of infection, then it can't be trusted to tell us that we are completely clear of the bacteria that is infectious.
Interestingly enough, I looked into the lab that Dr. Burrascano was supposed to have been working with for better testing - Milford Medical Labs -and found this site:
www.dnalymetest.com/faq.html Which is where I found this: "Patients with Lyme disease or Lyme disease-like borrelial infections do not always have the infectious agents in these body fluids. It is wasting health care resources to test a sample which is unlikely to have pathogenic borrelial bacteria in it even if the patient does have the disease because the spirochetes may be hiding in the deep tissues, and are not in the body fluids."
So while we are having some progress in the testing, there is still no way to guarantee that the blood sample you send in will contain evidence of an infection - so we are back to determining if a person has an infection by symptoms - with tests hopefully backing this up.