The principal of the South Dublin primary school confirmed the case earlier today on RTÉ's Today with Claire Byrne show.
All students in the class have been sent home as a precautionary measure in line with current public health guidance.
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The principal of the school added that the child did not contract the virus in the school.
Almost 500 students attend the school in 18 classes - however only the affected class has been sent home.
The school had reopened last Wednesday, having been closed since mid-March.
Speaking at a post-Cabinet press briefing, Minister for Education Norma Foley said it was not appropriate to comment on individual cases, but said the guidelines were clear regarding the procedures for when a student tests positive.
