Type of exposure Estimated risk of HIV transmission per exposure from a known HIV +ve individual not on ART
Receptive anal intercourse  1 in 90
 Receptive anal intercourse with ejaculation 1 in 65
  Receptive anal intercourse no ejaculation 1 in 170
Insertive anal intercourse  1 in 666
  Insertive anal intercourse not circumcised 1 in 161
  Insertive anal intercourse and circumcised 1 in 909
Receptive vaginal intercourse  1 in 1000
Insertive vaginal intercourse 1 in 1,219
Semen splash to eye<1 in 10,000
Receptive oral sex (giving fellatio)  <1 in 10,000
Insertive oral sex (receiving fellatio)  <1 in 10,000
Blood transfusion (one unit) 1 in 1
Needlestick injury  1 in 333
Sharing injecting equipment ( includes chemsex) 1 in 149
Human Bite <1 in 10,000