Table 2.

Parameter values from some published studies have been outlined, some of these would vary from one population to another and a few would need to be estimated from epidemiological data as there is limited information about them.

Parameter	Values/ranges	Source
Maximum fecundity $\left(\lambda \right)$	S. mansoni:$\left(0.05-0.34\right)\text{eggs}/\text{worm pair}$ S. haematobium:$5.2\text{ eggs}/\text{worm}/10\text{ml specimen}$	(Anderson & May 1982; de Vlas, Nagelkerke, & Habbema, 1993; De Vlas, Van Oortmarssen, Habbema, Gryseels, & Polderman, 1992; Truscott et al., 2017)
Aggregation parameter $\left(\alpha \right)$	$0.04-0.24$	( Anderson & May 1982; Anderson, Turner, Farrell, & Truscott, 2016; Chan et al., 1995; Toor et al., 2019)
Density dependent fecundity $\left(z\right)$	S. mansoni$0.0007$/female worm S. haematobium$0.0006$/female worm	(Anderson & May 1982; Anderson, Turner, Farrell, & Truscott, 2016; Turner et al., 2017)
Mean adult worm life span $\left(L_W\right)$	S. mansoni:$(2.7-10.5)$years S. haematobium:$\left(3-5\right)$years	(Anderson & May 1985; Anderson & May, 1991; Sturrock & Butterworth, 1995)
Drug efficacy	S. mansoni:$(79-92.5)\%$ S. haematobium:$(63-100)\%$	(Kihara et al., 2007, Utzinger et al., 2000) (Ojurongbe et al., 2014; Tchuem Tchuenté et al., 2004, Utzinger et al., 2000)
Mean parasite life expectancy in snail host $(\mu )$	S. mansoni in Biomphalaria glabarata$\left(7-42\right)\text{days}$ S. haematobium in Bulinus globusus$(14-28)\text{days}$	(Anderson & May, 1991)
Egg production aggregation parameter (r)	0 - 0.1	(Gurarie, King, Yoon, & Li, 2016)
Contact rate $\left(\beta \right)$	Varies according to study population	–
Age dependent contact rates $\left({\beta }_{age}\right)$	Varies according to study population	–
Number of worms, miracidia and cercaria	Relatively unknown	–
Proportion of miracidia which become cercariae	Relatively unknown.	–
Proportion of cercariae that survive each time step	Relatively unknown.	–