Copmanthorpe Primary School, in the North Yorkshire village of Copmanthorpe, closed at noon today for a full deep clean of the school buildings and equipment, the City of York Council said.
It will remain closed tomorrow and Wednesday but is expected to reopen on Thursday morning.
A City of York Council spokeswoman said: “We can confirm that Copmanthorpe Primary School will close at 12noon today, reopening on Thursday morning, following a suspected norovirus outbreak.
“The decision to close the school was taken following consultation with the council’s public health team and Public Health England, and will enable a full deep clean of the school buildings and equipment to be carried out.
“Over 50 pupils and staff have been affected by the outbreak so far.”