Estimated per act risk for acquisitionof HIV by exposure route[75]
Exposure Route
Estimated infectionsper 10,000 exposuresto an infected source
Blood Transfusion
9,000[76]
Childbirth
2,500[50]
Needle-sharing injection drug use
67[77]
Percutaneous needle stick
30[78]
Receptive anal intercourse*
50[79][80]
Insertive anal intercourse*
6.5[79][80]
Receptive penile-vaginal intercourse*
10[79][80][81]
Insertive penile-vaginal intercourse*
5[79][80]
Receptive oral intercourse*§
1[80]
Insertive oral intercourse*
0.5[80]§
* assuming no condom use§ source refers to oral intercourseperformed on a man