HIV Transmission & Risks

We have set out below the different risk percentages of contracting HIV depending on the type of exposure. This is for an encounter with someone with an uncontrolled, detectible HIV infection, who isn’t on anti-retroviral medication.

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 170

Insertive anal intercourse not circumcised: 1 in 161

Insertive anal intercourse and circumcised: 1 in 909

Vaginal intercourse

Receptive vaginal intercourse: 1 in 1000

Insertive vaginal intercourse: 1 in 1,219

Oral sex

Semen splash to eye: less than 1 in 10,000

Receptive oral sex (giving fellatio); less than 1 in 10,000

Insertive oral sex (receiving fellatio): less than 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; less than 1 in 10,000