Table 2 Parameter definitions and values. \( \beta \) and ρ are stated across the age groups 0–2, 2–5, 5–15, 15–70+. Parameter values as [11] for Ascaris and [10] for S. mansoni

\( {\mathrm{R}}_0 \)

Basic reproductive number or ratio

2.12

1.55

\( \upbeta, \uprho \)

Relative contact rates, relative contribution to the environmental reservoir

0.22, 1.88, 1, 0.53

0.036, 0.17, 1, 0.069

\( \upgamma \)

Egg production density dependence parameter

0.07

0.0006

\( \mathrm{k} \)

Shape parameter of negative binomial distribution of worms amongst hosts

0.9

0.24

\( \upsigma \) (/year)

Inverse of worm lifespan

1

0.1754

\( \uplambda \) (epg/female worm)

Net egg output per female worm

3983

0.14

reservoir decay rate (/year)

Rate of decay of eggs in the environmental reservoir

6

3

drug efficacy

Proportion of a host’s worms removed by a single treatment

99% (Albendazole)

86% (Praziquantel)