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(a) Evolution of virulence in horizontally and vertically transmitted BSMV populations. (From Stewart et al., 2005). (b) Tradeoff between the efficiency of horizontal and vertical transmissions for BSMV populations evolved upon a horizontal transmission scheme. (From Stewart et al., 2005). (c) Correlation between virulence and transmission rate in CMV. Different symbols represent different CMV genotypes. (From Escriu et al., 2003).
