A case of coronavirus has been identified at St Saviour's School.
A class bubble has been sent home and the children have been told to self-isolate.
They will be tested after five and eight, subject to parental or carer consent. The school remains open.
"All parents have been informed and the school remains open, following advice from Environmental and Public Health.
"The children in isolation will continue to receive school work and will carry on with their education. The premises has been disinfected and the school is continuing to follow the latest Public Health advice." - Mark Rogers, Director General of the Department for Children, Young People, Education and Skills.
It comes just days after a class from St Michael's private school was also closed because a child test positive for Covid-19.

Work begins on Haut du Mont Memorial Garden
Inflation in Jersey at 2.8%
Review rules out benefits overlap for pensioner carers
Ignoring data protection may cause Jersey to 'lose our economy'
Draft law scraps time limits on abortions in Jersey
Divide over approach to gender guidance in schools
Three charities awarded £500 grants in community campaign
Ministers back principle of social media 'restrictions' for under 16s