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Phase photomicrographs of uninfected mouse blood mixed with equal volumes of plasma from uninfected SCID mice (panel A); plasma from B. hermsii-infected BALB/c mice (panel B); and plasma from infected mice that had been centrifuged (panel C). In panel B numerous spirochetes are seen singly, in clumps, and adhered to the aggregate of blood cells. Panel C is an example of rouleaux formation. The size marker in each panel is 10 µm.
