Table 1.

Results for ELISA tests rEm18 and Em2-Em18, and rEm18-ICT for AE (alveolar echinococcosis), CE and PE (cystic and polycystic echinococcosis), and other pathologies. Percentages of sensitivity, specificity, and the performance index for each test are shown.

		No. of seropositive samples for the three tests
	No. of samples	rEm18-ICT	rEm18-ELISA	Em2-Em18-ELISA
AE	30	27	26	29
CE/PE	16	5	4	5
Other	66	1	3	5
Sensitivity, %		90.0	86.7	96.7
(95% CI)		(78.4–96.1)	(74.4–93.9)	(85.8–99.4)
Specificity, %		92.7	91.5	87.8
(95% CI)		(88.4–94.9)	(87.0–94.1)	(83.8–88.8)
Youden index		0.83	0.78	0.85
(95% CI)		(0.67–0.91)	(0.61–0.88)	(0.70–0.88)
Accuracy, %		92.0	90.2	90.2
(95% CI)		(85.7–95.2)	(83.6–94.1)	(84.4–91.6)
Positive likelihood ratio (LR+)		12.3	10.2	7.9
(95% CI)		(6.7–18.9)	(5.7–16.0)	(5.3–8.9)
Negative likelihood ratio (LR−)		0.11	0.15	0.04
(95% CI)		(0.04–0.25)	(0.06–0.30)	(0.01–0.17)
Diagnostic odds ratio		114.0	69.6	208.8
(95% CI)		(27.7–461.2)	(19.4–248.5)	(31.5–1314.4)