Q and A

Question

What is the risk of HIV transmission through oral sex?

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

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.

156 comments

  1. Roy Trevelion

    Hi Samson,

    As Simon says above, there are no cases of people catching HIV from receiving oral sex. So this risk is zero.

  2. Samson

    Someone gave me oral sex last week. we both are male and I didn’t know his health status. Im too depressed worrying can I possibly get HIV??

  3. Roy Trevelion

    Hi Steve,

    Please see this guide to oral sex and risk.

    But do you mean you are HIV positive? Please see this Q&A about oral sex and risk of HIV transmission.

  4. Steve

    I ejaculate (cum) in my partner mouth after 1 week i get HIV. Is it considered as high risk or low risk ? Can you tell me more details about this please, thanks.

  5. Roy Trevelion

    Hi Pip,

    Sorry, i-Base doesn’t have resources to answer questions on risks and transmission. But you can find all frequently asked questions here.

    Please see here for a question about oral sex and risk of transmission.

  6. pip

    Hi, i’m a 21 years old boy and had a short oral sex (3min) and short unprotected vaginal sex (3min, about ten pump) whit ejaculation with sex worker that i don’t know about her hiv status.
    And now i wants to know about the risk of transmission?
    Thanks for your answer

  7. Roy Trevelion

    Hi Samson,

    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.

  8. Samson

    Someone gave me oral 4 days ago , is it harmful for me,?

  9. Roy Trevelion

    Hi John,

    As Simon says above, there are no cases of people catching HIV from receiving oral sex. However, if you’re worried about sexually transmitted infections it’s a good idea to have a sexual health check.

  10. John

    Hi I had a oral sex with one sex worker yesterday . When she gave me blow job my penis was wounded on top and I had little bleeding but she told me she is not hiv positive. Is there any chances that I could receive any harmful desis like hiv or something I am worried please help me with answers.
    Thanks.

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