Figure 5. Predicted sex-specific virulence in two populations with different rates of vertical transmission.
Predictions for the evolution of sex-specific virulence in two populations where the relative weight of vertical transmission is lower (a) (for example, the Caribbean where transmission through breast-feeding is low) and higher (b) (for example, Japan where transmission through breast-feeding is higher). Figures show how the difference in virulence between men and women is predicted to be greater in Japan than in the Caribbean.