Eighteen residents and four staff have now tested positive at Brightwater's The Cove aged care home in Mandurah.
The new case numbers come as WA records 194 local Omicron cases, with the virus spreading to disability care and another aged home.
The state now has 724 active cases but no one in hospital, with WA Health on Friday also reporting a further eight travel-related cases.
Ability WA said two care workers had tested positive after working shifts at residential homes in Brentwood and Wanneroo.
Chief executive Jacquie Thomson said clients and their decision-makers had been notified and testing and infection control would be carried out.
"Our customers and employees' wellbeing is our priority. We will work closely with customers and their families to ensure they remain connected and well supported," she said in a statement.
Amana Living has meanwhile reported two cases, one involving a student nurse who worked at an aged care facility in Kinross this week.
The nurse is isolating at home and the Kinross home has been closed to visitors while residents and staff are tested.
The second case involved a community support worker who late last week visited clients at home in Perth's southeast.
Both were wearing masks and fully vaccinated.
"The majority of our staff and residents are triple vaccinated and our procedures are in place to help minimise the impact on our residents, clients, families and staff," Amana chief executive Stephanie Buckland said.
But the number of active cases at Juniper's Cygnet home in Bentley has dipped to nine after five residents made full recoveries.
New border dates expected next week
Premier Mark McGowan is expected to announce a new border reopening date next week, subject to receiving advice from the chief health officer.
Just over four weeks have passed since the premier announced an indefinite delay to the planned February 5 reopening.
At the time, the state had 79 active cases and a third-dose vaccination rate of 26 per cent.
More than 55 percent of eligible West Australians have now received their booster, while the state has recorded 486 local cases in the past three days.
An announcement on new public health restrictions is imminent, with Mr McGowan flagging they are likely to resemble those implemented in South Australia.
But the Australian Hotels Association urged the government not to implement a rule for hospitality venues of one person per four square metres.
"WA's hospitality venues are rightly concerned that they will again bear the brunt of excessive and deeply damaging COVID-19 restrictions," chief executive Bradley Woods said.
"Those advocating for unnecessarily harsh density limits ignore the fact that WA has the broadest mandatory vaccination policy in the country and the majority of eligible Western Australians are already triple vaccinated."
Australian Associated Press
