Table 1. Perinatal and postnatal transmission probabilities by antiretroviral drug (ARV) regimens.
| Regimen | Perinatal | Breastfeeding (per month) | |
|---|---|---|---|
| < 350 | > = 350 | ||
| No prophylaxis | |||
| Existing infections | |||
| CD4 < 200 | 37 | 0.89 | |
| CD4 200–350 | 27 | 0.81 | |
| CD4 > 350 | 15 | 0.51 | |
| Incident infections | 18.1 | 26.9 (one-time event) | 26.9 (one-time event) |
| Single dose nevirapine | 7.5 | 0.99 | 0.4 |
| WHO 2006 dual ARV regimen | 2.2 | 0.18 | 0.18 |
| Option A | 4.1 | 0.2 | |
| Option B | 1.9 | 0.13 | |
| ART | |||
| Started before pregnancy | 0.26 | 0.02 | |
| Started during pregnancy > 4 weeks | 1.4 | 0.11 | |
| Started during pregnancy < 4 weeks | 8.2 | 0.2 | |