Relationship between vcg type and virulence. Box plots show the relationships between vcg type and (A) skin infection, (B) liver infection, and (C) body temperature at euthanasia. The vcg genotypes are shown on the left. For details, see the legend to Fig. 3. Symbols: ^, vcg type C significantly higher than vcg type E (ANOVA); ^, vcg type C significantly lower than vcg type E (ANOVA); *, vcg type C significantly higher than vcg type E (χ2).