Official websites use .gov
A
.gov website belongs to an official
government organization in the United States.
Secure .gov websites use HTTPS
A lock (
) or https:// means you've safely
connected to the .gov website. Share sensitive
information only on official, secure websites.
Pathogen's ES level of virulence, plotted against (a) the host's recovery rate 
and (b) the rate of activation of the immune response μ. The dashed black line shows the ES virulence 
of nonplastic pathogens, whereas the amber and red lines show the respective ES levels 
and 
for plastic pathogens. Other parameter values: 
