Published: Thu, May 18, 2017
Medicine | By Megan Pierce

Undercooked Seafood May Contain Live Parasites, Warn Scientists

Undercooked Seafood May Contain Live Parasites, Warn Scientists

The doctors only began to suspect he might have anisakiasis (a parasitic disease) after they asked him if he had eaten sushi recently.

The worm attaches itself to the stomach lining, and can cause fever, vomiting, digestive bleeding, and severe pain.

In this case, the man was dealing with gut pain, vomiting and a fever for about a week before he turned up in hospital.

When it was removed the man's symptoms "resolved immediately".

An endoscopy showed that a "filiform parasite firmly attached" itself to the man's abdomen. Doctors found a parasite in his stomach.

The CDC says that people can try to cough up the worm or remove it by hand.

The study's lead author says Japan typically sees the most cases of the parasitic herring worm disease.

"It's quite common ... roundworms in fish species are something that you can come across even in the supermarket", Holley said.

"Some people experience a tingling sensation after or while eating raw or undercooked fish or squid".

He said he's found the worms while preparing meals of fish purchased in the supermarket. "This is actually the worm moving in the mouth or throat".

Scholars on the topic suggest the illness in general is under-estimated and under-diagnosed.

Although the anisakis parasite can live as a larva for several weeks in a human stomach, it will die before developing into an adult. Sometimes, vomiting expels the worm.

Along with avoiding raw fish, the CDC recommends that seafood be cooked to an internal temperature of at least 145° F (about 63° C).

Like this: