Thank you for your inquiry. From what we gather from the question, you were asking about the possibility of HIV transmission in the event that you had been fingered in the anus, with a finger that had previously come into contact with vaginal fluid.
From the information given, this scenario is determined to be of No Risk (transmission of HIV is not possible in the given scenario). Transmission is not possible in this scenario because the activity described (anal fingering with vaginal fluid) does not satisfy the components of the HIV transmission equation (see diagram below).
The equation is not met because although there is a possible presence of HIV carrying fluid (ie. vaginal fluid, anal secretions, semen, pre-cum, blood, breastmilk), there is no direct access to the bloodstream, through a High, Low, or Negligible Risk activity.
Although theoretically possible given certain circumstances involving bleeding fingers with direct access to the bloodstream inside the anus, the transmission of HIV from fingering using a finger that may contain vaginal fluid will not be successful. This is perhaps due to the indirect route in which the finger (and subsequent HIV carrying bodily fluid) would take, exposing the virus to oxygen along the way. Studies have shown that HIV is extremely volatile when exposed to an environmental surface, outside of a vacuum-sealed chamber (1). In this case, the finger (an environmental surface), and vaginal fluid, would interact in a way that is not conducive to HIV survival.
Recommendation: No need for HIV screening for this particular scenario. Please refer to a healthcare provider for additional health-related issues.
All the best,
AIDS Vancouver Online/Helpline, Cody
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HIV in the Environment (1)