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Virulence of WR and Wyeth VV strains in C57BL6/J mice after intranasal infection. Groups of five mice were infected with 106 (■), 105 (●), 104 (▲) and 103 (▼) p.f.u. of WR strain or 106 (□) p.f.u. of Wyeth strain, or uninfected (○). (A) Time course of the average body weight change of each group is presented. The average weight at day 0 is set as 1. The error bars indicate the standard deviations. (B) Survival curve of the infected mice in each group.
