Fig. 6

a The relationship between snail infection prevalence and human infection prevalence over a large range of snail-to-human transmission rate values, snail populations and habitat sizes. All other parameters are obtained from LHS. The model without snail age stratification estimates higher snail infection prevalence necessary to reach low (0–10%), medium (10–50%) and high (50+%) levels of human infection over a range of FOI and snail densities. b The relationship between the total miracidia and cercariae populations over a large range of snail-to-human transmission rate values and snail densities demonstrates a consistent positive relationship between miracidial and cercarial density. For abbreviations, see Fig. 2