Can Touching Snails Lead to Rat Lungworm Infection? Expert Insights

Concern about parasitic infection

Hello, doctor.
Today, I touched a snail on the road and did not wash my hands before going to work.
After a break at work, I touched food with my hands and ate it, but I was wearing gloves while working and also touched clothing.
I would like to ask if this could lead to an infection with Angiostrongyliasis (also known as rat lungworm disease).

You, 20~29 year old female. Ask Date: 2024/07/21

Dr. Liao Zhongxin reply Internal Medicine

Not every snail carries Angiostrongylus cantonensis, but developing the habit of washing hands after contact with wildlife or before eating is a good way to prevent disease infection.

Reply Date: 2024/07/21

More Info

Touching snails can indeed pose a risk for infection with the rat lungworm (Angiostrongylus cantonensis), which is a parasitic worm that can cause eosinophilic meningitis in humans. This parasite is primarily found in rats, and snails and slugs can serve as intermediate hosts. When humans accidentally ingest the larvae of this parasite, typically through contaminated food or water, they can become infected.

In your case, you mentioned that you touched a snail and then proceeded to eat without washing your hands. This is a potential risk factor for infection. The rat lungworm larvae can be present on the surface of snails, and if they are transferred to your hands and subsequently to your mouth, there is a possibility of infection. However, the risk can be mitigated by proper hygiene practices, such as washing hands thoroughly after handling snails or any potentially contaminated items.

It’s important to note that the risk of contracting rat lungworm disease from casual contact with snails is relatively low, especially if you did not directly consume the snail or its mucus. The larvae must be ingested in sufficient quantities to cause infection, and the likelihood of this happening through incidental contact is less than if you were to consume raw or undercooked snails or contaminated vegetables.

To further reduce your risk of infection, here are some recommendations:
1. Hand Hygiene: Always wash your hands thoroughly with soap and water after handling snails or any potentially contaminated materials. This is crucial before eating or touching your face.

2. Food Safety: Ensure that any vegetables or food items that may have come into contact with snails or slugs are washed thoroughly before consumption. Cooking food can also kill the larvae, making it safe to eat.

3. Awareness of Symptoms: Be aware of the symptoms of rat lungworm infection, which can include headaches, neck stiffness, nausea, vomiting, and other neurological symptoms. If you experience any of these symptoms after potential exposure, seek medical attention promptly.

4. Preventive Measures: If you live in or are visiting areas where rat lungworm is known to be prevalent, take extra precautions to avoid contact with snails and slugs, and be cautious about consuming raw or undercooked foods.

In summary, while touching a snail does carry some risk for rat lungworm infection, the actual likelihood of contracting the disease from incidental contact is low, especially if you practice good hygiene. If you have any concerns or develop symptoms, it is advisable to consult a healthcare professional for further evaluation and guidance.

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