Q and A

Question

What is the risk of HIV transmission through oral sex?

5 February 2018. Related: All topics, HIV transmission, Southern Africa.

First of all my thanks to everyone at i-Base!

I have a question regarding transmission. I am HIV positive and have a low viral load (under 250) and am not yet on medication. I always use condoms for anal intercourse but my questions relate to oral sex.

From what I’ve read, the risk increases:
• if the insertive partner has a high viral load.
• if the receptive partner has infections in the mouth or cuts, gum disease, has had recent dental work etc
• if the receptive partner takes semen in the mouth

Also, if the HIV positive receptive partner has blood in the mouth – could they possibly infect a negative partner

I can only find terms such as ‘low risk, very low’ but this all seems subjective. Low compared to the risk of unprotected intercourse doesn’t really mean much. Does that mean that with an undetectable/low/mid/high viral load that condoms should always be used or that if you avoid the higher risk scenarios unprotected oral sex is considered safe? I guess it all relates to the level of risk someone is willing to accept so I was hoping you might have some data e.g. percentage risk per act etc.

I read that there was a Spanish study reporting no seroconversions from 19,000 exposures over 10 years in serodiscordant couples and other reports saying that up to 5% of infections could be attributed to oral sex. Are there any recent studies to clarify the level of risk and also which reports would you regard as the most accurate?

I’ve recently met a great guy and it’s come to the point that I want to disclose my status. I’m hoping this might allow us both to put the level of risk into perspective.

Many thanks in advance and best wishes

Answer

Answer: Simon Collins

Thank you for your question.

HIV is not easily transmitted by oral sex – and it probably needs ALL the factors you listed. For example, the positive partner would have to have a very high viral load AND the negative partner would have to have oral concerns like bleeding gums or recent dental work.

There are no cases of people catching HIV from receiving oral sex (from a person who has blood in their mouth). This is zero risk.

Your viral load is currently very low, which make any risk incredibly low. If your viral load was undetectable on treatment, the risk would be zero for all types of sex.

In 2018, HIV treatment is routinely recommended for anyone who is HIV positive. This, together with the evidence that undetectable viral load prevents transmission has dramatically changed more discussions about HIV risk. A review of this evidence is at this link:
https://i-base.info/htb/32308

This booklet has more information about sexual transmission, including a section on oral sex:
https://i-base.info/guides/testing

For any further information please contact us via the website, e-mail or through the treatment information phoneline (Mon-Wed 12-4pm).

Best wishes for the future with your new partner.

Note: This answer was updated in February 2018 from a question first posted online in April 2010.

176 comments

  1. Josh Peasegood •

    Hi Anonymous, what you have described is very low risk. This person has told you that they are HIV negative and there is on reason to doubt them. Using a condom will have protected you from transmission and oral sex carries little to no risk meaning PEP would not be recommended.

    More information about transmission can be found here: https://i-base.info/qa/factsheets/hiv-transmission-and-testing

  2. Anonymous •

    Hello,

    I received oral sex from sex worker girl last two day ago but I didn’t take long,and we also did protected vaginal sex only around 30 seconds, I don’t even know if she has open sores or bleeding gums …but i ask her status of HIV and she said all clear but i didn’t trust her , so am I at risk!?
    Should i take PEP?

    Thanks

  3. Josh Peasegood •

    Hi Spankyex, please see here for more information about testing and transmission: https://i-base.info/qa/factsheets/hiv-transmission-and-testing

    Oral sex carries little to no risk of transmission. There has never been a documented case of transmission via this route. Saliva has antiviral properties which prevents HIV transmission. This means you do not need to be worried about this encounter and you do not require PEP.

    Even if this person was in the window period (which would be rare), oral sex is still very low risk.

  4. Spankyex •

    I had oral sex with a sex worker 11 days ago ( I licked her vagina) no intercourse occurred, after 3-4 days I managed to get her tested for confirmation, her test were negetive for hiv and hepa A and Hepa B , The test was antibody test. I am now worried if she had hiv recently just few weeks ago I gave her oral sex. Please help me I am worried

  5. Josh Peasegood •

    Hi Daniel, please see here for more information about transmission: https://i-base.info/qa/factsheets/hiv-transmission-and-testing

  6. Daniel •

    A man ejaculated on my penis then sucked my penis while his sperm was on my penis now i am a little bit suspicious about can his sperm get into uretra through his mouth ? And does that infect ?

  7. Josh Peasegood •

    Hi John, no these are not signs of HIV infection. As you are on PEP these symptoms would be delayed until after you complete the course AND would appear later than a few days after exposure.

    For more information please see here: https://i-base.info/qa/factsheets/hiv-transmission-and-testing

  8. John •

    Hi,

    I had an unprotected oral sex with a female sex worker (followed by a vaginal sex with condom). I was scared as heck so I started to take PEP (Biktarvy for HIV and doxycycline for syphilis) around 20 hours after the exposure.

    From two days ago I started to experience sore throat, and today, I have a light fever (37.3 C ~ 37.8 C). Just want to know whether these symptoms are indications of an HIV infection, and what’s the chance I got infected.

    Thanks.

  9. Josh Peasegood •

    Hi Kevin, oral sex carries little to no risk of transmission. More so as you don’t know your partners status it is more likely that they are HIV negative.

    This is a very low risk exposure, if any at all and does not require PEP.

    For more information about testing and transmission please see here: https://i-base.info/qa/factsheets/hiv-transmission-and-testing

  10. Kevin •

    Hi,

    I received oral sex from an unknown status girl but I didn’t take long, I don’t even know if she has open sores or bleeding gums … am I at risk!?
    Shall I take PEP ? Cz am panicking that much

    Thanks