]Exposure Route Estimated infections
per 10,000 exposures
to an infected source
Blood Transfusion 9,000[24]
Childbirth 2,500[25]
Needle-sharing injection drug use 67[26]
Percutaneous needle stick 30[27]
Receptive anal intercourse* 50[28][29]
Insertive anal intercourse* 6.5[28][29]
Receptive penile-vaginal intercourse* 10[28][29][30]
Insertive penile-vaginal intercourse* 5[28][29]
Receptive oral intercourse*§ 1†[29]
Insertive oral intercourse*§ 0.5†[29]
* assuming no condom use
§ source refers to oral intercourse
performed on a man
† "best-guess estimate"[/QUOTE