Estimated per act risk for acquisition of HIV-1 by exposure route
| Exposure Route | Estimated infections per 10,000 exposures to an infected source |
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| Blood Transfusion | 9,000 | |||
| Childbirth | 2,500 | |||
| Needle-sharing injection drug use | 67 | |||
| Receptive anal intercourse* | 50 | |||
| Percutaneous needle stick | 30 | |||
| Receptive penile-vaginal intercourse* | 10 | |||
| Insertive anal intercourse* | 6.5 | |||
| Insertive penile-vaginal intercourse* | 5 | |||
| Receptive fellatio* | 1 | |||
| Insertive fellatio* | 0.5 | |||
* assuming no condom use |
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