A Study of HIV Levels During Pregnancy and After Childbirth

The purpose of this study is to find out if HIV-infected pregnant women taking anti-HIV drugs have an increased amount of HIV in their blood (viral load) after having the baby. The purpose of A5153s, a substudy of A5150, is to characterize two anti-HIV drugs (nelfinavir \[NFV\] and lopinavir/ritonavir \[LPV/r\]) in HIV-infected women during pregnancy and after childbirth. Sometimes pregnant women have an increase in their HIV viral load after their baby is born. This study will try to find out how often this happens. It will also examine possible reasons why the increase in viral load occurs.