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| HIV Drug Resistance Mutations | Maternal Antiretroviral Therapy Regimen | |
| ZDV, 3TC, NVP (n = 287) | ZDV, 3TC, NFV (n = 200) | |
| HIV-PCR positive by 6 mo | 15 | 9 |
| Total with HIV drug resistance mutations | 7 | 9 |
| NRTI resistance | 5 | 9 |
| NNRTI resistance | 6 | 0 |
| PI resistance | 0 | 0 |
One mother was originally taking NVP/ZDV/3TC, but was changed to NFV/ZDV/3TC at week 14.
