Concerns About Seafood Parasites and Wound Infection Risks - Family Medicine

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Seafood parasites


I would like to ask the doctor, recently I had a mouth ulcer and while eating hot pot, the shrimp shell accidentally touched the wound.
Later, I realized that the shrimp was cooked in a simmering broth rather than a rolling boil.
Although the shrimp turned red, I still want to ask if there is a risk of bacteria or parasites entering through the wound.
Thank you!

Niming, 20~29 year old female. Ask Date: 2022/04/02

Dr. Lin Zhebin reply Family Medicine


Hello: From my understanding, seafood is typically subjected to low-temperature freezing treatment shortly after being caught, so there should not be an issue with parasites, unless there is a lapse in the handling process.
However, once the seafood is served and begins to thaw, there is a possibility of bacterial growth.
According to your description, the shrimp should be cooked, but it is not a completely sterile environment, and I cannot guarantee that bacteria won't enter through a wound.
However, our mouths are naturally filled with many bacteria, and not everyone develops an illness from this, so it should not have a significant impact on your body.
If you are still concerned, I suggest monitoring the wound in your mouth over the next few days for any changes.
If it becomes more red, swollen, painful, or if there is an increase in discharge, it would be advisable to seek medical attention to evaluate the wound and provide appropriate treatment.

Reply Date: 2022/04/02

More Info


When it comes to concerns about seafood, particularly regarding the risk of infections from bacteria or parasites, it's essential to understand the potential hazards and how to mitigate them. In your case, you mentioned that you had a mouth sore and accidentally came into contact with a shrimp shell while eating. Let's break down your concerns regarding wound infections and seafood-related risks.

1. Infection Risks from Seafood: Seafood can harbor various pathogens, including bacteria like Vibrio species, which are commonly associated with marine environments. Vibrio vulnificus, in particular, is a concern for individuals with compromised immune systems or underlying health conditions, such as liver disease or diabetes. However, for healthy individuals, the risk of infection from incidental contact with seafood is relatively low. In your case, if the shrimp was cooked properly, the heat should have killed most pathogens. Cooking shrimp until they are opaque and firm is crucial, and while you mentioned that the shrimp was cooked in simmering broth rather than boiling, if they turned red and were cooked through, the risk of bacterial infection is significantly reduced.

2. Wound Infection: Regarding your mouth sore, while it is theoretically possible for bacteria to enter through an open wound, the likelihood of developing an infection from a brief contact with a shrimp shell is low, especially if the shrimp was cooked. The primary concern would be if the wound was exposed to raw seafood or contaminated water. If you notice any signs of infection, such as increased redness, swelling, warmth, or pus at the site of the sore, it would be prudent to consult a healthcare professional.

3. Parasites: Seafood can also carry parasites, such as those from undercooked fish or shellfish. However, shrimp are less commonly associated with parasitic infections compared to other seafood like fish. The cooking process typically eliminates these risks. If you are concerned about parasites, ensure that seafood is sourced from reputable suppliers and cooked to safe temperatures.

4. Preventive Measures: To minimize the risk of infections from seafood in the future, consider the following precautions:
- Always cook seafood thoroughly. The USDA recommends cooking shrimp to an internal temperature of 145°F (63°C).

- Avoid consuming raw or undercooked seafood, especially if you have any open wounds or compromised immune function.

- Practice good hygiene, such as washing hands before handling food and ensuring that any cuts or sores are properly covered.

- If you have underlying health conditions, consult with your healthcare provider about additional precautions you should take when consuming seafood.

5. When to Seek Medical Attention: If you experience any unusual symptoms after your meal, such as gastrointestinal distress (nausea, vomiting, diarrhea), fever, or if the sore in your mouth worsens, it is advisable to seek medical attention. A healthcare professional can provide a thorough evaluation and determine if any treatment is necessary.

In summary, while there is a theoretical risk of infection from seafood, the actual risk from your described scenario appears to be low, especially if the shrimp was cooked properly. Maintaining good food safety practices and being aware of your health status can help mitigate these risks. If you have further concerns or experience any symptoms, don't hesitate to reach out to a healthcare provider for personalized advice.

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