| Activity |
Risk-per-exposure |
| Vaginal sex, female-to-male, studies in high-income countries |
0.04% (1:2380) |
| Vaginal sex, male-to-female, studies in high-income countries |
0.08% (1:1234) |
| Vaginal sex, female-to-male, studies in low-income countries |
0.38% (1:263) |
| Vaginal sex, male-to-female, studies in low-income countries |
0.30% (1:333) |
| Vaginal sex, source partner is asymptomatic |
0.07% (1:1428) |
| Vaginal sex, source partner has late-stage disease |
0.55% (1:180) |
| Receptive anal sex amongst gay men, partner unknown status |
0.27% (1:370) |
| Receptive anal sex amongst gay men, partner HIV positive |
0.82% (1:123) |
| Receptive anal sex with condom, gay men, partner unknown status |
0.18% (1:555) |
| Insertive anal sex, gay men, partner unknown status |
0.06% (1:1666) |
| Insertive anal sex with condom, gay men, partner unknown status |
0.04% (1:2500) |
| Receptive fellatio |
Estimates range from 0.00% to 0.04% (1:2500) |
| Mother-to-child, mother takes at least two weeks antiretroviral therapy |
0.8% (1:125) |
| Mother-to-child, mother takes combination therapy, viral load below 50 |
0.1% (1:1000) |
| Injecting drug use |
Estimates range from 0.63% (1:158) to 2.4% (1:41) |
| Needlestick injury, no other risk factors |
0.13% (1:769) |
| Blood transfusion with contaminated blood |
92.5% (9:10) |
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