TABLE 1.

Comparison of DFA with commercial PCR (group 1) as EIA verification tests^a

DFA result	No. of samples with indicated EIA and PCR results
	EIA reactive (n = 134)		EIA NGZ (n = 108)		Total
	PCR +	PCR −	PCR +	PCR −
+	102	7	9	1	119
−	6	19	12	86	123
Total	108	26	21	87	242

^aThe NGZ was defined as extending to 50% below the cutoff value. +, positive result; −, negative result.