Can You Contract STDs from Sharing Food with an Infected Friend?

Ingesting saliva from a person suspected of having a sexually transmitted infection (STI)?

Hello doctor, I went out with a friend yesterday and learned that he had sex with a stranger a few days ago, and I'm not sure if they used protection.
My friend hasn't gotten tested yet, but since it's his first time, he mentioned some swelling and discomfort while urinating, and he's worried that the other person might have a sexually transmitted infection (STI) because I've heard that this man has been with many partners.
I shared the same food with my friend, but I have a sore in my mouth.
If my friend tests positive for an STI, am I at risk of contracting one? Should I get tested as well?

Xiao Ai Ren, 10~19 year old female. Ask Date: 2018/08/07

Dr. Du Mingyi reply Urology

Saliva is not contagious.

Reply Date: 2018/08/07

More Info

When it comes to the transmission of sexually transmitted diseases (STDs), it's important to understand the modes of transmission and the specific risks associated with different activities. In your case, you are concerned about the possibility of contracting an STD from sharing food with a friend who may have been exposed to an STD.

First and foremost, STDs are primarily transmitted through direct sexual contact, which includes vaginal, anal, and oral sex. The pathogens responsible for STDs, such as HIV, gonorrhea, chlamydia, and syphilis, are typically found in bodily fluids like blood, semen, vaginal secretions, and breast milk. The risk of transmission through casual contact, such as sharing food or utensils, is extremely low.

In your specific situation, sharing food with a friend who may have an STD does not pose a significant risk of transmission. The primary concern would be if there were direct contact with infected bodily fluids. For example, if your friend had an open sore or bleeding gums and there was direct exchange of blood or other fluids, there could be a risk. However, the act of sharing food itself does not facilitate the transmission of STDs.

You mentioned that you have a sore in your mouth. While having an open sore can increase the risk of infection from various pathogens, the likelihood of contracting an STD through shared food is still very low. Most STDs require specific conditions for transmission, and casual sharing of food does not meet those conditions.

However, it is always wise to be cautious and proactive about your health. If you are feeling anxious about the situation or if your friend does test positive for an STD, it would be a good idea to consult with a healthcare professional. They can provide guidance on whether you should get tested based on your specific circumstances and any symptoms you may be experiencing.

In summary, while the risk of contracting an STD from sharing food with an infected friend is extremely low, it is important to stay informed and take care of your health. If you have any concerns or symptoms, seeking medical advice and possibly getting tested would be a prudent step. Remember, open communication with your friend about health and safety is also important, especially if they are experiencing symptoms that could indicate an STD.

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