Table 1. Comparative evaluation of the Schistosoma PCR-ELISA system and the Kato-Katz technique for the diagnosis of S. mansoni infection.

	Positive	Negative	Total
Kato-Katz fecal examination (2 slides – 83 mg feces)
PCR-ELISA
Positive	26	36	62
Negative	1	143	144
Total	27	179	206
	Kappa index = 0.491
Kato-Katz fecal examination (12 slides – 500 mg feces)
PCR-ELISA
Positive	37	25	62
Negative	1	143	144
Total	38	168	206
	Kappa index = 0.663