Guardian - May 2017 - "Popularity of sushi has brought rise in parasitic infections, warn doctors : Doctors have highlighted the need for awareness of anisakiasis, caused by the larvae of a worm found in contaminated undercooked or raw fish or seafood "
From NHS - Jan 2017
Parasites in fish, particularly anisakis larvae, can cause health problems if eaten alive, including abdominal pain, diarrhoea and vomiting, blood and mucus in stools, and mild fever.
Allergic reactions can also occur, which may be accompanied by a rash and itching, and even anaphylaxis in rare situations.
Anisakis larvae are colourless and normally coiled like a spring within a cyst. Larvae range in size from 5mm to 20mm in length.
The Food Standards Agency has issued the following advice for anyone eating wild Atlantic salmon or sea trout privately caught at sea or from UK rivers: [go to appropriate page]
So cook all food thoroughly.