Doctor Warns Raw Shrimp Risk in Thailand Case

A senior doctor has warned that eating raw shrimp can lead to serious parasitic infection, after a case highlighted the risks beyond common food poisoning. On 26 April, Dr Jessada Bunyawongviroj, deputy director of Maharaj Nakhon Ratchasima Hospital, shared details of a patient who developed gnathostomiasis after consuming raw seafood. The condition caused swelling that moved across the body, as parasites migrated under the skin.

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The warning followed a social media post by Dr Jessada, known online as “Mor Jed”, questioning whether a simple dish like shrimp in fish sauce could result in surgery. He described the case of a patient named Ploy, who was infected with Gnathostoma larvae, a parasite capable of penetrating the intestinal wall and travelling through body tissues. Unlike common intestinal worms, the parasite does not remain in the gut and can surface in different areas over time.

Symptoms typically include swelling, pain, itching or a tight sensation beneath the skin, with a key feature being that the affected area shifts location. This movement often leads to misdiagnosis as an allergic reaction or inflammation. In some cases, symptoms temporarily subside, giving the impression of recovery, while the parasite continues migrating internally.

The main sources of infection are raw or undercooked foods, particularly seafood such as shrimp and fish. Dishes like shrimp in fish sauce or marinated shrimp do not involve heat, and acidity or salt levels are insufficient to kill parasites. Freshwater fish may also carry larvae, and infection can occur without any visible warning signs.

Dr Jessada noted that while raw salmon in regulated systems may carry lower risk due to freezing controls, it is not entirely risk-free. Shellfish such as oysters pose different dangers, including bacterial infections like Vibrio. He emphasised that food quality alone does not eliminate risk if proper cooking is not applied.

Preventive measures include thorough cooking, which is the most effective method to destroy parasites. Freezing at very low temperatures may reduce risk but requires strict control standards. Choosing reputable food sources can help lower exposure but cannot guarantee safety.

He also clarified that taking deworming medication after consuming raw food does not prevent infection, as many treatments only target parasites in the intestines. Gnathostoma larvae can move from the digestive tract, requiring specialised treatment rather than routine medication.

The Daily News reported that the case has prompted renewed caution over consuming raw seafood, particularly in informal or unregulated settings. Health professionals continue to advise the public to weigh the risks carefully when choosing uncooked dishes.

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Adapted by ASEAN Now Dailynews 27 Apr 2026

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