"Symptoms include flu-like symptoms like tiredness, general aches and pains, headaches and fever, as well as loss of appetite, nausea or vomiting, diarrhoea, abdominal pains, jaundice, very dark urine and itchy skin, " he said.

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It is very frequently associated with dermatitis herpetiformis, an itchy red raised rash with fluid-filled vesicles.

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