There has been a steady increase of cases of measles across the North East.
It is estimated there are 30 new cases every week and doctors are urging parents to get their children vaccinated against the disease.
The most affected are children aged between 10 and 14 and living on Teesside.
The last major outbreak was in Hartlepool in 2009, where clinics were set up so more children could be vaccinated.
Doctors say parents should protect their children against the disease.
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Jarrow School and Jarrow Cross C of E Primary School were shut on Tuesday to allow a deep clean to take place.
The unusual discoveries in Blackhall Colliery have been made since 2014, including four this year.