Fig. 1
An illustrative selection of worm burdens over time in five individuals set against the mean worm burden in the human population. X-axis: year of simulation. Y-axis: the number of parasites per individual host. Part of the population is treated and benefits immediately while untreated individuals benefit over time via ‘herd effects’ through natural worm mortality as infectious material in the environment is reduced. Four children are born in year five and are eligible for treatment. Three are treated under a semi-systematic treatment setting, and attend most treatments. One systematically does not comply with treatment. One adult is ineligible and does not receive treatment. Treatments are annual with eight rounds from year 10 onwards (parameter values as defined in Table 2)