Comparative Evaluation of Different Test Combinations for Diagnosis of Mycobacterium avium Subspecies paratuberculosis Infecting Dairy Herds in India

Table 2

Comparison of different diagnostic test combinations for the diagnosis of Johne’s disease.

Sample size	Test combinations		Combinations of tests (%)
	A	B	A^+ & B^+ (TP)	A^− & B^+ (FN)	A^+ & B^− (FP)	A^− & B^− (TN)
204	Serum ELISA	Milk ELISA	16 (7.8)	18 (18.8)	22 (10.8)	148 (72.6)
68	Faecal Microscopy	Faecal PCR	21 (30.9)	10 (14.7)	16 (23.5)	21 (30.9)
207	Milk PCR	Milk ELISA	23 (11.1)	6 (2.9)	11 (5.3)	167 (80.7)
62	Serum ELISA	Fecal PCR	25 (40.3)	5 (8.1)	5 (8.1)	27 (43.5)

TP: positive in A and B, TN: negative in A and B, FP: positive in A and negative in B, and FN: negative in A and positive in B.