As a precaution, people in these groups are being advised to avoid eating uncooked smoked fish.
Professor Saheer Gharbia, from the UKHSA, said: “Most people won’t have any symptoms of the infection or will only experience mild symptoms, such as abdominal pain or diarrhoea, which usually pass within a few days without the need for treatment.
“However, some people are at higher risk of much more serious illness.
“If you have any concerns…