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Effect of within-host viral accumulation on transmission rate and virulence of vector-borne plant viruses. The transmission rate can be decomposed into two steps: from infected plant to vector (βp→v) and from viruliferous vector to healthy plant (βv→p). Within-plant (x) and within-vector (y) viral accumulation are thought to have an effect on mortality of the plant (αp) and vector (αv), respectively.
