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The elasticity of infection prevalence 
(blue), infection abundance 
(red) and basic reproduction number 
(magenta) as functions of ε. Transmission of infection is density-dependent with β11 = 3.750, β22 = 3.106 and 
. Other parameter values as in figure 1. Circles at ε = 0 and ε = 1 are calculated from formulae in §§2.2 and 2.3, respectively. (Online version in colour.)
