Students and staff from two classes at Halls Head Primary School have been sent into isolation following a confirmed COVID case.
In an email to parents and families, Principal Peter Beckingham said the positive case was in a Year 6 class and a Pre-Primary class on Tuesday.
It is unclear whether the infected person was a staff member or a student.
"Our school will continue to operate as per normal, with some alterations to play areas and lunch areas," Mr Beckingham said.
Halls Head Primary is one of 30 schools across WA that have been impacted by COVID.

Pop-up ice skating rink glides back into Mandurah for winter school holidays
Federal opposition leader Angus Taylor sits down with local business owners in Mandurah
Police search for missing man last seen leaving Rockingham Hospital
West Aussies urged to be on high alert after surge in winter house fires
New $3.4 million boardwalk to be constructed at Lake Clifton thrombolites
City of Mandurah rolls out new tactile bin lids, accessibility stickers to support residents with low vision
Driver dies in hospital after Australind crash
Welfare concerns for woman with dementia last seen in Cooloongup
Charges laid over fatal West Coolup crash
