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Transmission of B. turicatae-gfp by tick bite. Five mice were fed upon by ticks infected with B. turicatae expressing gfp (Bt-gfp, colored circles) or wild-type spirochetes with the same genetic background (Bt-wt, colored triangles). Mice were sampled daily and spirochete densities in the blood determined by qPCR. A horizontal red line within a given day represents the average spirochete density for the group of positive animals.
