Infection Risks in Shared Food Situations - Urology

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What are the modes of transmission among colleagues?


Hello, doctor.
We have a new colleague who joined our unit.
At the end of August, we ordered breakfast together, and there was a portion of chicken nuggets.
We shared it, and he directly ate the chicken nuggets from the paper bag with his mouth, while I took some out to eat after he finished.
Today, during our conversation, he mentioned that he had surgery for warts in his throat in June, which he contracted from a sexual partner.
I’m really worried about the risk of infection.
What should I do? Can I touch things he has touched? Is there a risk of infection from contact with his clothing? I apologize for my lack of knowledge in this area and would greatly appreciate your help in clarifying this.
Thank you very much.

Pei, 30~39 year old female. Ask Date: 2023/12/21

Dr. Jian Weihong reply Urology


Transmission primarily occurs through sexual activity.
If not treated and there is contact with bodily fluids, there is still a risk of transmission.

Reply Date: 2023/12/21

More Info


When it comes to understanding infection risks in shared food situations, particularly in the context of communicable diseases, it's essential to consider the modes of transmission for various pathogens. In your scenario, you shared food with someone who had a history of a sexually transmitted infection (STI), specifically one that was transmitted through intimate contact. The primary concern here is whether such infections can be transmitted through shared food or utensils.

Firstly, it's important to clarify that most STIs, including those that can cause conditions like genital warts (caused by the human papillomavirus, HPV), are primarily transmitted through direct sexual contact. They are not typically spread through casual contact or shared food. The risk of transmission through shared food, especially when it involves solid foods like chicken nuggets, is extremely low. This is because STIs require specific conditions for transmission, such as direct contact with infected bodily fluids (like semen, vaginal secretions, or blood), which is not the case when sharing food.

In your situation, since the individual used their mouth to take food directly from the bag, the concern might arise from the potential for saliva exchange. However, most STIs, including HPV, are not transmitted through saliva. The only exceptions are certain infections like cytomegalovirus (CMV) or herpes simplex virus (HSV), but even these have very low transmission rates through casual contact, especially in the context of shared food.
Regarding your concerns about touching items that the individual has touched, the risk remains very low. STIs do not survive long outside the human body, and casual contact with clothing or surfaces is unlikely to pose a risk. If the person had an active infection that could be transmitted through skin-to-skin contact, such as herpes, the risk would still be minimal unless there was direct contact with an active lesion.

In terms of your emotional response and anxiety about the situation, it's understandable to feel concerned, especially when health is involved. However, it is crucial to rely on factual information about how infections are transmitted. If you are still feeling anxious, consider discussing your concerns with a healthcare professional who can provide you with personalized advice and reassurance.

In summary, the risk of contracting an STI through shared food, especially in the manner you described, is extremely low. The primary modes of transmission for STIs are through sexual contact and not through casual interactions or shared meals. If you maintain good hygiene practices, such as washing your hands before eating and avoiding direct contact with any lesions or bodily fluids, you should be at minimal risk. If you have further concerns or experience any symptoms, it would be wise to consult a healthcare provider for further evaluation and peace of mind.

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