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Host's ES rate of activation μ plotted against virulence levels: (a) 
for a plastic pathogen and (b) α for a nonplastic pathogen. Blue lines show the host's ES rate of immune activation and red lines the pathogen's ES level of virulence. ⊕ indicates a coevolutionarily stable strategy and ⊗ a coevolutionary repeller. Parameter values as in Fig. 4.
