Dataset from An Open-label Study Evaluating the Resistance Profile of Single Dose Nevirapine(NVP) When Combined With a 4 or 7 Day Course of Combivir® (ZDV/3TC) Compared to Single Dose Nevirapine for the Prevention of Mother to Child Transmission (pMTCT) of HIV - Treatment Options Preservation Study (T.O.P.S.)

To determine whether a regimen of single dose nevirapine combined with either 4 or 7 days of Combivir®, compared to a regimen of single dose nevirapine, for the prevention of mother to child transmission can reduce the rate of development of drug resistant mutations of HIV-1, in HIV-1 infected pregnant women, who have not received antiretroviral therapy previously.