Refined stratified-worm-burden models that incorporate specific biological features of human and snail hosts provide better estimates of Schistosoma diagnosis, transmission, and control

Table 8 Parameters and their expected ranges based on calibration

Parameter	Symbol [units]	Value range
Force of infection (FOI)	λ [worm/year]	Child: (0, 8)
Force of infection (FOI)	λ [worm/year]	Adult: (0, 3)
Maximum egg release	ρ ₀ [egg/female]	Child: (10, 70)
Maximum egg release	ρ ₀ [egg/female]	Adult: (1, 25)
Crowding threshold	w ₀ [worm]	(50, 200)
Egg aggregation^a,b	r ^a	(0, 0.1)
Child FOI for adult calibration	λ _C [worm/year]	(0, 8)

^aDimensionless parameter
^bAggregation factor for daily egg counts when modelled as a negative binomial distribution

ISSN: 1756-3305