Table 1.

Performance of Chagas Quick Test (Cypress Diagnostics, Belgium) in a nonendemic area

		Reference standard
		1. Active screening (AS)			2. Passive screening (PS)			AS + PS
Chagas Quick Test®	Test results	Positive	Negative	Total	Positive	Negative	Total	Positive	Negative	Total
	Positive	194	4	198	18	1	19	212	5	217
	Negative	43	311	354	1	68	69	44	379	423
	Total	237	315	552	19	69	88	256	384	640
	CD prev	42.9%			21.6%			40.0%
	Sensitivity*	81.9% (77.6–87.2)			94.7% (73.9–99.9)			82.8% (77.6–87.2)
	Specificity*	98.7% (97.0–99.6)			99.0% (92.2–99.8)			98.7% (97.0–99.6)
	PPV*	97.7% (94.7–99.0)			94.7% (72.0–99.2)			97.7% (94.7–99.0)
	NPV*	89.6% (86.8–91.9)			98.6% (91.0–99.8)			89.6% (86.8–91.9)

CD prev = Chagas disease prevalence in the subpopulation.

^*Sensitivity, Specificity, PPV = positive predictive value, and NPV = negative predictive value expressed as a percentage and 95% CI.