TABLE 1.

Sensitivity and specificity of each method for the diagnosis of E. histolytica infection with reference to PCR-confirmed cases

Result	Performance relative to PCR (no. of samples)			Sensitivity (% [95% CIa ])	Specificity (% [95% CI])
	Positive	Negative	Total
E. histolytica Quik Chek
Positive	17	1	18	44.7 (30.1–60.3)
Negative	21	618	639		99.8 (99.1–100)
Total	38	619
O&Pb
Positive	25	1	26	65.7 (49.9–78.8)
Negative	13	618	631		99.8 (99.1–100)
Total	38	619
Combination of O&P and Quik Chekc
Positive	30	2	32	78.9 (63.7–88.9)
Negative	8	617	625		99.7 (98.8–99.9)
Total	38	619

^aCI, confidence interval.

^bO&P, ova and parasite examination.

^cJudged as positive when either O&P or Quik Chek produced a positive result.