Figure 2.

Theoretical framework and data for virulence-mediated transmission trade-off. A morbidity score is a proxy for virulence, an infectiousness score is a proxy for per-contact transmission potential, and the activity level is a proxy for a contact rate. The values for infectiousness and activity are re-scaled to allow better visualization. Lines are adjusted to pass through data. Thus, this figure does not show a fit but instead a conceptual framework in which our data can be placed and interpreted. (Online version in colour.)