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Parents have been asked to check their children for symptoms of scarlet fever.
The advice comes after a pupil from St George's Primary School, Chequers Road, Minster, was diagnosed with the infection. It's understood he is a seven-year-old boy.
In a message to parents and guardians, the school advised they get symptoms checked out by a doctor.
According to the NHS, last year 5,746 children nationwide were affected by the illness.
Deputy head teacher Louise Rowley-Jones said: "We've notified the parents of vulnerable children.
"We follow the usual guidance with childhood diseases and will allow the children back 24 hours after being given antibiotics."
The youngster affected is said to have stayed at home while parents contacted the school to let them know.
Initial signs someone might have the illness include flushed cheeks, sore throat, swollen tongue and a pink-red rash.
It can be passed from person to person through sharing clothes, touching skin and coughs and sneezes from an infected person.