Fig. 2. The laissez-faire case: Impact of duration of immunity on epidemic dynamics and the economy in the absence of intervention.

(A) Impact of the pathogen on the economy for different levels of duration of immunity. (B) Reduction in the numbers of susceptible hosts in the population. The lines are colored to reflect different rates of loss of immunity (blue, 6 months; orange, 1 year; green, 2 year; red, 3 years). (C) The numbers of hospitalized patients. (D) Time course of utility loss due to deaths during the course of the epidemic under four different strategies. Values of the economic and epidemiological parameters are described in Table 1.