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Number of patients with positive/borderline results of anti-Borrelia IgM (a) and IgG (b) antibodies obtained by immunoblotting for patients infected with the Epstein–Barr virus (EBV), cytomegalovirus (CMV) and BK virus (BKV): B.a, Borrelia afzelii; B.b, Borrelia burgdorferi; B.g, Borrelia garinii; B.sp, Borrelia spielmanii.
