Table 1.

Infants classified by Maternal ARV regimen and either infant ARV regimen, or timing of maternal ARV initiation (n=405).

Infant ARV	Maternal ARV
	No ARV	Single NRTI	sdNVP + ZDV	cART
No ARV	125	18	0	0
Single NRTI	4	137	21	14
sdNVP+ZDV	5	8	44	2
cART	4	2	1	20
Timing of maternal ARV initiation
No ARV	138	0	0	0
Labor and delivery	0	15	10	1
During trimester of delivery	0	146	53	20
Prior to trimester of delivery	0	4	3	15

Abbreviations: Abbreviations: ARV = antiretroviral; cART = combination antiretroviral therapy; NRTI = nucleoside reverse transcriptase inhibitor; sdNVP = single-dose nevirapine; ZDV = zidovudine