Welcome to our Forum. I see that you have submitted the same question to our colleagues on the International Forum. I anticipate that you will get similar answers from each of us. As you have already learned, the risk of this infection is quite low. Condom protected sex is safe sex, most CSWs do not have HIV or other STIs, most exposure to infected partners do not lead to infection, and cunnilingus is a particularly inefficient means for transmission of infection. with this background, I'll go straight to your questions:
1) How would you assess my risk of contracting HIV or any other STDs assuming that I could have swallowed little amount of menstrual blood/vaginal fluid?
See above, very, very low, even if you swallowed vaginal secretions or blood. If you need the peace of mind that comes from negative tests, the most important test for you is a throat swab for gonorrhea and chlamydia.
2) Have you ever in your career encountered or read about a case where cunnilingus was the sole route through which HIV transmission to a man occurred? In this regard, how would you assess the trustworthiness of those very few allegedly documented cases? Is it likely that the patients did not tell or recall everything and that in reality cunnilingus was not the sole unprotected exposure involved?
In science one can never say never. It is, I suppose plausible that a few people have acquired HIV through cunnilingus but I consider them to be the "exceptions that prove the rule". The risk of infection, again, IF your partner was infected, is less than 1 in 10,000.
3) As I understand from my reading, for cunnilingus to pose a realistic threat different aggravating circumstances have to coincide; e.g. swallowing profuse amounts of menstrual blood/vaginal fluid, sores and bleeding gums and no saliva in the mouth. Again in this regard, is it known whether any of these circumstances were present in those few "documented" cases?
That would be my sense as well.
4) Can my symptoms be attributed to ARS?
Most unlikely. ARS is typically rather severe, flu-like illness.
5) 26 days after the exposure I had a general screening for STDs the results of which I will learn in a couple of days. The tests included a combined HIV test for antibody and for p24 antigen. If the latter is negative is it a reliable sign that I am HIV-?
If these tests are negative, you can be quite confident that you did not get HIV from the encounter that you describe. I anticipate that this will be the result (i.e. your tests will be negative) and hope that you will believe the results when you get them.
I hope these comments are helpful. Try not to worry. EWH
I'm pleased I could help. EWH
Dear Dr. Hook,
Thank you for your helpful and relieving reply.