NHS, last I checked, employs a C6 to test for Lyme. This study suggests a diifferent interpretation needs to be at least considered if a positive is rendered: B Miyamotoi. https://www.clinicalmicrobiologyandinfection.com/article/S1198-743X(19)30418-5/fulltext Edit to Add: What kind of Pandora's Box does this open relative to the whole "highly conserved proteins" claims made for C6 testing?