St Kilian's Primary School will remain open after a parent of a current student tested positive for coronavirus.
School principal Daniel Gooch sent a letter to families on Friday confirming the case.
The parent of the student has been in isolation and away from school since Monday when their test was conducted.
Other family members have now been tested and are in isolation waiting for results.
In the letter, Mr Gooch said the school will remain open given no other current active COVID-19 cases were connected the school.
"The requirement of the Department of Health and Human Services and Catholic Education Sandhurst is for St Kilian's to remain open," he said in the letter.
"As a consequence, the school will be open, for onsite learning to occur. This may change in the coming days depending on the outcome of any further COVID-19 testing results."
Catholic Education Sandhurst director Paul Desmond said he supported Mr Gooch's decision to keep the school open.
"There are no active cases in the school, it's the parent," he said. "We very much hope he or she is well soon.
"We're always sorry to hear anybody has contracted this virus whether they are connected to our school or (not).
"Schools work very hard to remain calm for young people. Life goes on and, to the greatest extent, the main aim is to always make sure the kids remain safe."
Mr Gooch said the situation may cause concern for families in the school community.
"I encourage parents/carers to exercise their own judgement in decided whether to send their child/children to school," he wrote.
"Any parents/carers who are concerned about the safety and/or wellbeing of their children attending St Kilian's School in the coming days may choose to keep them home, until further information is known."
The positive test makes St Kilian's the fourth Catholic Education Sandhurst school to be connected to a positive coronavirus test.
Earlier this week, a Catherine McAuley College student and St Joseph's Primary School teacher both tested positive for coronavirus. Both schools are now closed for cleaning.
Holy Rosary School in Heathcote also closed as a precaution due to a connection to one of the positive cases. All three schools will re-open on August 5.
"The cleaning process has commenced at all three schools," Mr Desmond said. "St Joseph's is very well advanced and Holy Rosary in Heathcote has commenced.
"Catherine McAuley College began yesterday, but being over two sites it's a big undertaking. We want to be as thorough as we can be so all four sites ready for safe return of students."
Mr Gooch encouraged families to be vigilant about their health.
"Please isolate and seek medical attention immediately if any COVID-19 symptoms are experienced or observed," he said.
"The school will continue to follow the protocols and procedures regarding COVID-19 and I will continue to keep the school community informed."
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