Three children at Friarswood Primary School in Newcastle-under-Lyme, Staffs., are confirmed to have been infected with the 0157 strain of the bacteria, which causes diarrhoea and vomiting.
However, the Health Protection Agency (HPA) said another six probably cases and seven more suspected cases were being investigated.
None of the children has been hospitalised and all three confirmed cases are now recovering, said an HPA spokesman. E.coli 0157 can occasionally causes serious kidney complications.
The first case was reported to the HPA last Thursday, said the spokesman, with two more following late last week.
The school was closed yesterday (Thursday 8 March) due to rising numbers of possible cases, to prevent the outbreak spreading further and allow a deep clean.
Councillor Liz Staples, from Staffordshire County Council, said: "Early indications show that the infection originated from an outside source and was brought into school.
“We are looking to open the school as soon as it is safe to do so, and are working closely with the HPA to see when this is possible."
Dr Rob Carr, an HPA consultant, said: "We are arranging for samples to be taken from children and staff at the school to determine when it is safe for them to return."
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