Can Deep Kissing with Mouth Sores Increase HIV Infection Risk? - Urology

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Can kissing someone with a mouth ulcer transmit HIV?


I would like to ask, yesterday I engaged with a sex worker.
I have a mouth ulcer (caused by excessive heat, lasting about 3 days, with no bleeding).
However, I accidentally engaged in deep kissing with the sex worker.
If the partner is an HIV carrier, what is the likelihood of me being infected? (I used a condom for intercourse but had unprotected oral sex, and only engaged in deep kissing.) Thank you, doctor.

leo, 20~29 year old female. Ask Date: 2024/02/25

Dr. Liu Mingyue reply Urology


Hello: You can refer to https://www.cdc.gov.tw/File/Get/ZTz2fTlh4Yw_QhF94gqU3A - Low-risk activities: masturbation - Low-risk activities: mutual masturbation, light kissing, mutual rubbing, sexual intercourse with condom - Moderate-risk activities: deep kissing, oral sex, withdrawal method - High-risk activities: unprotected sex, causing wounds or bleeding if the sexual partner has an infectious disease, which should be considered moderate to high risk.

Reply Date: 2024/02/25

More Info


Deep kissing, especially when one partner has mouth sores, can indeed raise concerns about the risk of HIV transmission, although the overall risk remains relatively low. To understand this better, let's break down the factors involved.

Firstly, HIV (Human Immunodeficiency Virus) is primarily transmitted through specific bodily fluids, including blood, semen, vaginal fluids, rectal fluids, and breast milk. The virus is not transmitted through saliva in significant amounts, which is why casual contact, such as kissing, is generally considered low risk. However, deep kissing can pose a risk if there are open sores or bleeding gums involved, as these can provide a pathway for the virus to enter the bloodstream.

In your case, you mentioned having mouth sores for about three days, which were not actively bleeding. While the absence of blood reduces the risk, the presence of sores can still increase susceptibility to infection. If the other person is HIV positive and has a viral load that is detectable, the risk of transmission through deep kissing could be higher, particularly if there was any exchange of blood or if the sores were open enough to allow for potential entry of the virus.

The Centers for Disease Control and Prevention (CDC) categorizes different sexual activities by their risk levels. Deep kissing is considered a medium-risk activity, especially when there are factors like sores or bleeding involved. On the other hand, protected sexual intercourse (using condoms) significantly reduces the risk of HIV transmission, as condoms provide a barrier that prevents the exchange of bodily fluids.

Given that you engaged in protected intercourse and only had unprotected oral contact, the overall risk of HIV transmission remains low. However, if you are concerned about potential exposure, it is advisable to get tested for HIV and other sexually transmitted infections (STIs) after a potential exposure. Testing is the only way to confirm your status and alleviate any anxiety you may have.

In addition to HIV, it is also important to consider other STIs that can be transmitted through oral sex, such as gonorrhea, chlamydia, and syphilis. Regular screenings and open communication with sexual partners about health status can help mitigate risks associated with sexual activities.

If you experience any symptoms such as fever, sore throat, or swollen lymph nodes in the weeks following the exposure, it is crucial to seek medical advice promptly. These symptoms can be indicative of various infections, including STIs, and should be evaluated by a healthcare professional.

In summary, while deep kissing with mouth sores does carry some risk for HIV transmission, the overall likelihood remains low, especially given your use of protection during intercourse. If you have concerns, testing and consultation with a healthcare provider are the best steps to take for your peace of mind and health.

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