This guideline looks at the use of Post-Exposure Prophylaxis (PEP) following sexual exposure. For information on the use of PEP following occupational exposure, the following advice is helpful.
This isn’t something we’re going to come across very often. This is an excellent resource if faced with an affected patient. It gives tables with risks from different exposures (eg anal sex vs sharing needles etc) and the chance of the source being HIV positive depending upon their sexuality and the area they are from, when their status is unknown.
Risk of HIV transmission = risk that source has HIV (where status is unknown) x risk following exposure.
Where the source is known to be HIV positive, the risk of transmission is equal to the risk following exposure.