Sushi lovers at risk of parasites in undercooked fish

The sushi retail market is worth about £68million in the UK

During an interview, the man said he had recently eaten sushi.

Below, the endoscopy results show the worm-like parasite larvae firmly attached to the lining of the 32-year-old patient's gut.

A special kind of net was used to remove the larvae "and the patient's symptoms resolved immediately", the team from a central Lisbon hospital said.

In response to the findings, a Food Standards Agency (FSA) spokesperson told HuffPost UK: "Occasionally raw fish, for example salmon, contains parasitic larvae, such as Anisakis, which can make you ill". Ninety percent of the cases are in Japan, and the disease is also frequent in Scandinavian countries due to cod liver consumption.

Carmo said that "in European countries, fish infestation is probably more frequent than we thought".

Another study in Spain found that almost 56% of blue whiting fish sold in five chain supermarkets showed infestation, Carmo said.

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Symptoms include abdominal pain, nausea and vomiting and complications such as digestive bleeding and bowel obstruction and perforation.

Raw fish can at times carry tiny worms that can lodge into a human gut when eaten. "Eventually, the parasite dies and produces an inflamed mass in the esophagus, stomach, or intestine". No specific drug exists that can simply kill it dead, so endoscopic surgery is one popular option.

There are other ways of getting rid of the worm.

Rising numbers of people are being infected with a parasitic worm known as anisakis after eating seafood that hasn't been frozen or heated properly, local media reported Friday. This is actually the worm moving in the mouth or throat. In such cases, it is possible to cough up the worm or remove it by hand.

The NHS warns that eating fish that is not fresh or that has not been stored and prepared hygienically can lead to food poisoning. Freezing raw fish at minus 4 degrees F (minus 20 degrees C) or below for 7 days, or freezing raw fish at minus 31 degrees F (minus 35 degrees C) until solid and storing at minus 4 degrees F (minus 20 degrees C) for 24 hours, is also sufficient to kill parasites, the FDA said.

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