TABLE 1.

Detailed results for all samples assayed and all techniques

Subset	No. of samples	Resulta
		Standard algorithm				New fourth-generation assay
		Architect	WB	NAAT	Final	Ab	Ag	Final
A	357	Negative	NA	NA	Negative	Negative	Negative	True negative
	3	Negative	Negative	<37	Negative	Positive	Negative	False positive
	2	Positive	Positive	NA	Positive	Positive	Negative	True positive
	2	Positive	Positive	NA	Positive	Positive	Positive	True positive
	1b	Positive	UD	Detectable	Positive	Positive	Positive	True positive
B	145	Positive	Positive	NA	Positive	Positive	Negative	True positive
	13	Positive	Positive	NA	Positive	Positive	Positive	True positive
C	23c	Positive	Negative	<37	Negative	Negative	Negative	True negative
	4c	Positive	UD	<37	Negative	Negative	Negative	True negative
	2c	Positive	Negative	<37	Negative	Positive	Negative	False positive
	1c	Positive	UD	<37	Negative	Positive	Negative	False positive
	4b	Positive	UD	Detectable	Positive	Positive	Negative	True positive
	2b	Positive	Negative	Detectable	Positive	Positive	Positive	True positive
	2b	Positive	Negative	Detectable	Positive	Negative	Positive	True positive
	1b	Positive	UD	Detectable	Positive	Positive	Positive	True positive
	1b	Positive	UD	Detectable	Positive	Negative	Positive	True positive
	3d	Positive	Negative	<37	Positive	Negative	Negative	False negative
	3d	Positive	Negative	<37	Positive	Positive	Negative	True positive
	1d	Positive	UD	<37	Positive	Positive	Negative	True positive
	1e	Positive	Negativef	<37	Positive	Positive	Negative	True positive

^aNA, not applicable; UD, undetermined.

^bAcute infection.

^cArchitect false-positive result.

^dMaternal antibodies.

^eHIV-2 infection.

^fOur routine confirmatory test detects only antibodies against HIV-1 (New LabBlot HIV-1); this sample was confirmed when assayed with a Western blot assay specific for HIV-2 (New LabBlot HIV-2).