Fig. 2

Probabilities of vaccine being cost-effective for a range of VCPI and willingness-to-pay, with R₀ =2.2. Subplots correspond to the scenarios without pre-existing immunity (a, b), and with an average of 8% pre-existingimmunity (c, d) in the population. The relative transmissibility of asymptomatic infection was set to 10% (a,c) and 90% (b,d). Solid line represents the willingness-to-pay threshold corresponding to the average of per capita GDP of Colombia between 2013 and 2017. Dashed line represents three times the average of per capita GDP of Colombia. The red curve represents the 90% probability of vaccine being cost-effective for a given VCPI