Table 2.

Summary of the parameters used in this study

Parameter	Definition
p(intro)	The probability of the herd becoming infected during time period t
p(free)	The probability of freedom from infection at time t
prior	The prior probability that the herd is infected
N	The number of animals in the herd
pstar	The herd-level prevalence of infection
d	The number of infected animals
n	The number of animals that are tested
sesystem	The herd-level sensitivity of the test system
seherd	The sensitivity of SICCT implemented as a herd test
separt	The herd-level sensitivity of a diagnostic test implemented on part of a herd
seSICCT	The sensitivity of SICCT
seslh	The sensitivity of slaughterhouse surveillance
spherd	The herd-level specificity of a test
spanimal	Specificity of a diagnostic test applied on an individual animal level

SICCT, Single intradermal comparative cervical tuberculin test.