When to seek emergency help
She added: “If you are worried or concerned you can get advice from 111 who can arrange a phone call from a nurse or doctor if you need one.
“You should call 999 or go to A&E if you or your child vomit blood, have vomit that looks like ground coffee or have green or yellow-green vomit.
“If you suspect something poisonous might have been swallowed, have a stiff neck and pain when looking at bright lights or have a sudden severe headache or stomach ache you should also call 999 or go to A&E.”
Levels of norovirus are highest among the elderly and very young due to the nature of schools and care homes.