Information about the index partner (the person the patient had sex with)

Exposure

Risk if the index HIV status not known

Estimated risk of HIV transmission per exposure from a HIV-positive individual not on suppressive ART

A man who has sex with men living in England Receptive anal sex (index penis into patient anus) 1 in 4,000 1 in 90
A man who has sex with men living in England Insertive anal sex (patient’s penis into index anus) 1 in 28,000 1 in 666
A man who has sex with men living in England Receptive vaginal sex (index penis into patient’s vagina) 1 in 43,000 1 in 1000
A man who injects drugs Receptive vaginal sex (index penis into patient’s vagina) 1 in 180,000 1 in 1,000
A heterosexual man living in England Receptive vaginal sex (index penis into patient’s vagina) 1 in 170,000 to 1 in 5 million 1 in 1,000
A women living in England Insertive vaginal sex (patient’s penis into index vagina) 1 in 140,000 to 1 in 12 million 1 in 1,219