An Evaluation of MAPIA in Michigan as an Ante-Mortem Supplemental Test for Use in Suspect Tuberculosis Cattle

Table 2

Sensitivity, specificity, positive predictive value, and negative predictive value of a weak or strong positive reaction to at least three antigens (criterion 3) in the MAPIA test, by different antecedent tests.

MAPIA test criteria*	Results	True status		Test performance		Predictive value
		Positive (𝑛=49)	Negative (𝑛=185)	Sensitivity	Specificity	Positive	Negative
CFT suspect/reactor	Positive	11	2	84.62	92.31	84.62	92.31
	Negative	2	24
CCT suspect	Positive	1	2	50.0	90.91	33.33	95.24
	Negative	1	20
IFN-γ suspect	Positive	12	10	70.59	81.82	54.54	90.0
	Negative	5	45
Traceback	Positive	0	4	—	80.0	—	100.0
	Negative	0	16
Exposed	Positive	0	0	—	100.0	—	100.0
	Negative	0	58