Daybreak's Health Editor Dr Hilary Jones has told viewers that Norovirus is "very bad news".
He said: "Although it's not hugely a life-threatening it is the most common form of gastroenteritis in adults in the UK."
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The RSPCA are trying to find who is responsible for leaving the trap out as they are warning they could be breaking the law.
Fine start to the week for most but turning wet and windy from Wednesday.
Thousands of people have lined the banks of the Mersey to see Cunard's three flagship ocean liners sail down the river.