Table 1. Main parameters used in the quantitative microbial risk assessment and susceptible-infected-recovered models developed to simulate waterborne diarrheal infections in children < 5 in Puri District due to Cryptosporidium and Giardia in drinking water from deep (DTW) and shallow (STW) tubewells over two monsoon seasons.

Parameter Symbol (Fig 1): Description (distribution)	Parameter value(s) of distribution or point estimate	Source
QMRA parameter set
MR: Method recovery (beta binomial) Crypto. mean = 55%, Giardia mean = 34%	Crypto. = α = 1.9, β = 1.9 Giardia = α = 3.0, β = 6.0	[15]
V: Viability (beta binomial) Crypto. mean = 38%, Giardia mean = 13%	Crypto. α = 1.65, β = 2.46 Giardia α = 2.93, β = 17.4	[25, 26]
H (HUM scenario): Mean fraction of human parasites	Crypto. = 100%, Giardia = 100%	[15, 27–29]
H (ENV scenario): Mean fraction of human parasites	Crypto. = 6%, Giardia = < 1%	[15, 27–29]
H (MST scenario): Mean fraction of human parasites	DTW 2012 = 50%, STW 2012 = 16% DTW 2013 = 20%, STW 2013 = 33%	[15, 30–38]
$\widehat{\mathit{Z}}$ (ENV and MST scenario): Mean fraction of non-human parasites infectious-to-humans [zoonotic faction]	Crypto. = 41%, Giardia = 19%	[15, 30–38]
Sp (HUM, ENV, MST scenarios): Mean fraction of parasites of a species infectious-to-humans	$Sp=H+\left(1-H\right)\times \widehat{Z}$
LR: Reduction from boiling water	Crypto. = 6 Log10, Giardia = 6 Log10	[39]
L: Liters of water ingested per day (uniform)	a = 0.893, b = 1.39	[40, 41]
r: Exponential dose response parameter (triangular dist.)*	Crypto. = a = 0.00021, c = 0.0042, b = 0.0500 Giardia = a = 0.0097, c = 0.0198, b = 0.0358	[42–44]
SIR parameter set
TW: Probability of using a particular tubewell type	DTW = p = 48% STW = p = 52%	Base line survey
B: Probability of boiling tubewell water before drinking (Bernoulli)	DTW = p = 9% STW = p = 16%	Base line survey
P(s): Morbidity ratio for diarrheic infection (Bernoulli, where p is uniform**)	Crypto. = p = a = 29%, b = 68% Giardia = p = a = 49%, b = 59%	[9, 45–47]
D: Duration of illness (gamma) Crypto. mean = 10 days, Giardia mean = 11days	Crypto. = shape = 1.1, scale = 9.2 Giardia = shape = 3.2, scale = 3.4	[17, 48–51]
Re: Reduced recall of diarrhea 2 or more days after occurrence (Bernoulli, where p is uniform**)	p = a = 12%, b = 52%	[52]

* a, c, b for the triangular distribution are minimum, mode, and maximum respectively.

** a and b for uniform distribution are minimum and maximum.