Western Australia has recorded 20 new local COVID-19 cases, almost all of which are linked to existing clusters.
Eight of those cases are linked to the nightclub clusters in Perth, in particular the Library Nightclub.
Premier Mark McGowan is urging anyone who has been to an exposure site or is unwell to get tested.
Only one of the new cases is not linked to a previous cluster.
Nine new exposure sites were added to the WA Health locations website on Sunday, including businesses in the greater Perth area, Bullsbrook, Swan Valley, Coolgardie and Norseman.
Mr McGowan said the nightclub clusters represented a "situation that continues to be monitored".
Despite the clusters, the Premier said no thought was being given to shutting down nightclubs with mask-wearing already in place and expanded vaccination requirements to roll out from Monday.
"When the time comes, we'll put in place further public health measures," he said.
"You don't want to put them in before you need them, and you don't want them too late, it's a delicate balance to get it right.
"If you put them in too early, you get people getting sick of them over time."
Mr McGowan said such measures were being analysed by the government and chief health officer now.
A total of 5,435 COVID-19 tests were conducted across the state on Saturday, a drop from the 7,011 conducted the day before.
There are 147 active cases in WA, with one person in hospital.
AMA continues to push for reopening date
Meanwhile, the WA branch of the Australian Medical Association is continuing to urge the state government to set a target for reopening.
AMA WA president Mark Duncan-Smith said doctors were worried about a delay to reopening that could see the state open during the already busy winter peak in hospitals.
"We're really calling on the government for a new target date — within one, to two, to three months — that doesn't coincide with the winter peak," he told ABC News Breakfast.
Dr Duncan-Smith said he was also concerned about the impact of an "open-ended closure" on the community.
"Society [needs to] have a target, a bit of certainty in uncertainty, and it'd be psychologically better for society and individuals," he said.
In total, 97.4 per cent of the state's population over 12 has now received one dose of a COVID vaccination, 90.5 per cent has received two doses and 33.9 per cent of people over 16 have received a booster.
Fears border uncertainty will deter overseas students
Ahead of students returning to school on Monday, the WA opposition said there were still several questions to be asked about the government's COVID-19 plans.
Opposition education spokesman Peter Rundle said he was also concerned plans had "gone adrift" for returning international university students after the border reopening was delayed.
"I know that our international students don't know when they can come in — I'm worried about us losing students to the eastern states," he said.
"I think we've seen that already in the business sector, where we're potentially losing executives and companies."
Trinity Residential College head David Gee said WA had been losing significant market share during the pandemic.
"I think a lot of the students that chose universities in Western Australia — and all five of them have been significantly hit — chose it because we were safe and had a safe transition plan and were given some clear assurances," he said.
"Now there are very mixed messages as to whether they can get in at all."
Mr Gee said those who had committed to studying in WA were in limbo.
"They've booked flights, got everything sorted and are now being told you can't come, with not really any clarity," he said.
"Will it be in March? Do they hang on for two weeks, or find other alternatives?
"We talk a lot about mental health with COVID, but the international students to me seem to be forgotten."
Ad campaign from nurses' union to encourage compliance
Meanwhile, WA's nursing union says it will spend up to $250,000 on a campaign to encourage "sensible measures to stop the spread of Omicron".
"What I see the government doing is pretty well nothing at the moment, even though we've got these rising case numbers of Omicron," Australian Nursing Federation state secretary Mark Olson said.
He said the advertising campaign, which was still being worked on, would encourage:
- People to wear N95 masks on public transport
- Businesses to allow staff to work from home
- The reintroduction of density limits in public spaces
Mr Olson said the measures were similar to those in place in South Australia.
"These are all things that we can do at the moment that are relatively small on the inconvenience scale but it will slow the spread of Omicron," he said.
"And the reason that we need to slow the spread of Omicron is that our hospitals aren't ready."
He said the campaign would also ask people to stay away from hospitals and aged care facilities, unless it was "absolutely necessary".
"I've watched those lovely people who are acting in concierge-type roles at the front of our hospitals," he said.
"Sure, they're handing out masks and they're smiling and they're very pleasant, but I rarely hear them ask the question: have you been to a hotspot? Are you vaccinated?"
Mr Olson also asked the government to provide hospital staff with more parking at their workplace, or N95 masks they could wear on public transport.
Liquor stores ready for new rules
On Monday, expanded vaccination requirements will come into effect in WA.
Anyone who has not been double-dose vaccinated will not be allowed into many businesses, including restaurants, cafes, indoor entertainment venues and gyms.
Peter Peck, the head of WA's Liquor Stores Association, and said bottle shops were ready to start enforcing that change from tomorrow.
"Swim with the current, adapt with us and it'll feel like normal," he said.
"Swim against the current with us and it just makes things complicated and it just [causes] trouble for everyone.
"If someone wants to cause trouble, we're well and truly ready for it but hopefully it will just be business as usual."
Mr Peck said the rules also gave businesses and staff comfort in knowing their risk of being exposed to the virus would be reduced.
"We've got a duty to our customers but also to our staff, to have a safe work environment," he said.
"They are coming into contact with a lot more people than the average person, and so that [risk] does sit in their mind."
