Table 1.

Detection limits of the challenge strain-specific probes assessed using a dilution series of standard concentrations of their cognate templates

	DIVA assay Ct
	CBR/93	UK2000/7.1
Standard copy number
5 × 10 5	27.3	30.7
5 × 10 4	31.3	34.2
5 × 10 3	34.9	37.6
5 × 10 2	38.5	42.0
5 × 10 1	None	None