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Proportion of SLEV Vero infectious particles following passage on DAE tick cell culture [(Vero p.f.u. ml−1)/(RNA genomes ml−1)]. Columns represent mean±sem of three lineages. A significant decrease in Vero infectiousness was measured with passage (one-way ANOVA, P = 0.0084, F = 8.018, R2 = 0.62).
