Table 1.

Classification of infant HIV infection comparing DBS HIV-1 RNA results with HIV-1 plasma RNA results at the threshold of ≥1,000 copies/mL (panel a) and ≥10,000 copies/mL (panel b) and comparing DBS HIV-1 RNA results with DBS HIV-1 DNA results at the threshold of ≥1,000 copies/mL (panel c) and ≥10,000 copies/mL (panel d), Tanzania, 2008-9

a		Plasma RNA			b		Plasma RNA
		≥1,000	<1,000	total			≥10,000	<10,000	total
	≥1,000	34	1	35		≥10,000	31	0	31
DBS RNA	<1,000	0	141	141	DBS RNA	<10,000	0	145	145
	total	34	142	176		total	31	145	176
SN 1.00 (0.90, 1.00), SP 0.99 (0.96, 1.00) PPV 0.97, NPV 1.00					SN 1.00 (0.89, 1.00), SP 1.00 (0.97, 1.00) PPV 1.00, NPV, 1.00
c		DBS DNA			d		DBS DNA
		Positive	Negative	total			Positive	Negative	total
	≥1,000	35	0	35		≥10,000	31	0	31
DBS RNA	<1,000	1	140	141	DBS RNA	<10,000	5	140	145
	total	36	140	176		total	36	140	176
SN 0.97 (0.86, 1.00), SP 1.00 (0.97, 1.00) PPV 1.00, NPV 0.99					SN 0.86 (0.71, 0.94), SP 1.00 (0.97, 1.00) PPV 1.00, NPV 0.97

SN = sensitivity

SP = specificity

PPV = positive predictive value

NPV = negative predictive value

95% confidence intervals are shown in brackets