Table 2.

Serological results obtained, including post-surgical patients without abdominal cystic echinococcosis as controls

VIRapid® test, Lima				VIRapid test, Pavia* (weak bands considered positive)				VIRapid test, Pavia* (weak bands considered negative)				ELISA RIDASCREEN test, Pavia‡
Performance (95% CI)	CE pos	CE neg	Total	Performance (95% CI)	CE pos	CE neg	Total	Performance (95% CI)	CE pos	CE neg	Total	Performance (95% CI)	CE pos	CE neg	Total
Test pos	25	17	42	Test pos	24	37	61	Test pos	22	21	43	Test pos	18	23	41
Test neg	8	64	72	Test neg	9	43	52	Test neg	11	59	70	Test neg	9	51	60
Total	33	81	114	Total	33	80	113	Total	33	80	113	Total	27	74	101
Sensitivity	0.76 (0.67–0.83)			Sensitivity	0.73 (0.63–0.81)			Sensitivity	0.67 (0.57-0.75)			Sensitivity	0.67 (0.57–0.76)
Specificity	0.79 (0.69–0.85)			Specificity	0.54 (0.43–0.62)			Specificity	0.74 (0.63–0.80)			Specificity	0.69 (0.57–0.76)
PPV	0.59 (0.48–0.67)			PPV	0.39 (0.30–0.48)			PPV	0.51 (0.41–0.60)			PPV	0.44 (0.33–0.53)
NPV	0.89 (0.81–0.94)			NPV	0.83 (0.74–0.89)			NPV	0.84 (0.76–0.90)			NPV	0.85 (0.76–0.91)
LR+	3.61 (2.72–4.27)			LR+	1.57 (0.14–2.06)			LR+	2.54 (1.84–3.20)			LR+	2.15 (1.51–2.80)
LR–	0.31 (0.25–0.39)			LR–	0.51 (0.39–0.70)			LR–	0.46 (0.35–0.61)			LR–	0.48 (0.36–0.67)

CE = cystic echinococcosis; neg = negative; LR– = negative likelihood ratio; LR+ = positive likelihood ratio; NPV = negative predictive value; pos = positive; PPV = positive predictive value.

^*One serum from one post-surgical case with no abdominal cystic echinococcosis cyst at the time of screening was not available for analysis in Pavia.

^‡Sera from three uninfected, four post-surgical, and six cystic echinococcosis (CE)-infected individuals (three CE stage 1, 1 one CE stage 3a, one CE stage 3b, and one CE stage 5) were not available for testing.