The British Medical Journal Case Reports is linking the increasing popularity of sushi in western countries to a rise in parasitic infections, reports the BBC.

Doctors are warning of the dangers of ingesting parasites from raw and undercooked fish, after they encountered cases of infection.

A new report includes the case of a Portuguese patient in Lisbon, who was found to have parasite larvae on his gut ling after suffering from stomach pain, vomiting, and fever for a week.

The diagnosis, anisakiasis, is a parasitic disease caused by anisakif nematodes that can invade the stomach wall or intestine of humans, BBC said.

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