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Levels of viremia (measured by rRT-PCR) in sheep co-infected with BTV-1 and BTV-8. Each plot shows the Cq values for the detection assay (black circles), the BTV-1 typing assay (red down-triangles), and the BTV-8 typing assay (blue up-triangles). The grey shaded areas indicate when uninfected Culicoides sonorensis were fed on the sheep.
