Table 2. Posterior means and 95% posterior credibility intervals (PCI) of sensitivities (Se) and specificities (Sp) for the PCR tests performed in bulk tank milk (PCR BTM) and indoor dust samples (PCR DUST), for the 2 models with different priors for the specificity of PCR DUST.

PCR BTM (n = 380) and PCR DUST (n = 380) tests were performed in 95 dairy cattle herds in the Finistère department, France between November 2012 and April 2014.

	Model 1 Sp PCR DUST~Unif(0.95, 1)		Model 2 Sp PCR DUST~Unif(0, 1)
Parameter	Mean	95% PCI	Mean	95% PCI
Se PCR BTM	0.71	[0.64;0.77]	0.83	[0.75;0.91]
Se PCR DUST	0.74	[0.68;0.80]	0.75	[0.69;0.80]
Sp PCR DUST	0.96	[0.95;0.97]	0.72	[0.63;0.81]
τ 0 a	0.18	[0.09;0.29]	0.15	[0.08;0.22]
τ 1 b	0.93	[0.88;0.97]	0.91	[0.84;0.96]
Deviance	724		651

^a probability of the bacteria becoming present on a farm between two consecutive tests

^b probability of the bacteria disappearing from a farm between two consecutive tests