TABLE 3.

Flock-level comparison of clinical diagnosis and aprV2/B2 qPCR using 758 lesion swabs collected from 40 Australian sheep flocks^a

Clinical diagnosisb	No. of flocks with a laboratory diagnosis (aprV2/B2 qPCR) of:c
	Benign	Virulent	Total
Benign	5	11	16
Virulent	0	24	24
Total	5	35	40

^aMcNemar's χ² = 11.0, P = 0.0009; kappa statistic = 0.353 (95% CI, 0.105–0.601), DSe = 100% (95% CI, 87.5–100%), DSp = 31.3% (95% CI, 11.0–58.6%).

^bClinical diagnoses are given in Table 1.

^cqPCR according to reference 21. Benign, swabs tested negative for the aprV2 allele; virulent, ≥1 swab tested positive for the aprV2 allele.