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Dark-field images of B. burgdorferi spirochetes cultured from mouse tissues necropsied 18 months after completion of treatment. Magnification, ×400. (A) Note the numerous spirochetes from ear culture of a saline solution-treated C3H mouse infected with strain N40. (B) Ear culture of a ceftriaxone-treated B6 mouse infected with strain B31. (C) Front joint of a ceftriaxone-treated B6 mouse infected with strain N40.
