Table 2.

Definitions of the parameters used in the model.

Parameter	Definition (units)	Parameter estimate	Reference
N	Number of pigs per pen	25	[10]
PensPerSide	Number of pens on either side of a corridor	20	[10]
β	Infection rate	Assume $1.67\times {10}^{-3}$	–
$\gamma$	The rate at which a pig ceases to remain infectious (day−1)	$\frac{1}{26}$ = 0.03846	[13,14]
$\delta$	The rate at which a carrier becomes re-infectious (day−1)	$\frac{1}{108}$ = 0.00926	–
$∊$	The rate at which a pig ceases to carry the bacteria (day−1)	$\frac{1}{60}$ = 0.01667	[14]
$\nu$	Loss of immunity (day−1)	0.5	–
λ	Shedding rate (cfu day−1)	$2.25\times {10}^4$	[15,16]
$\kappa$	Proportion of cfu present ingested (day−1): Slatted	$4.23\times {10}^{-4}$	[17,16]
	Solid	$3.17\times {10}^{-5}$
l	Bacteria death rate (day−1)	$\frac{1}{84}$ = 0.01190	[18]
p	Probability of infection from bacterial consumption	$2.30\times {10}^{-6}$	[19,13]
α	Cross infection rate	Assume $1.14\times {10}^{-6}$	–
π	Proportion of faeces that remains in a room	0.4	–
q	Proportion of faeces that remains present after cleaning	0.1	–
$T_{\mathit{max}}$	Time spent in unit (days)	108	[20]
$\omega$	Airborne infection rate	Assume $1.02\times {10}^{-14}$	–