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Copy numbers of B. burgdorferi DNA of flaB-ospA genes in heart base (HB), ventricular muscle (VM), and tibiotarsus (TT) of C3H and B6 mice infected with either strain N40 or B31 at 12 (A) and 18 (B) months after ceftriaxone and saline solution treatment. *, significantly higher copy number (P < 0.05). The error bars indicate SD.
