Table 1.

System variables for the SWB model

SWB prevalence strata:
k Δw ≤ w < (k + 1)Δw	{h k(t) : k = 0, 1, …}
with worm burden increment Δw	∑k h k = 1
Demographically structured SWB:
Child	h Ck(t)
SAC	h Sk(t)
Adult	h Ak(t)
Population densities per unit habitat:
human	H(t)
SEI (susceptible, infected, patent) snail	N(t) = x(t) + y(t) + z(t)