Western Australia has detected one new local COVID-19 case as an infected quarantine hotel worker spreads the virus.
The new case is a household contact of the Perth Hyatt Hotel security guard who tested positive a day ago, WA Health said in a statement on Thursday.
Authorities are working to determine the guard's genomic sequencing and investigations remain under way into how he became infected.
Meanwhile, tests have revealed that a Pan Pacific security guard infected with the Omicron variant contracted the virus from two overseas travellers who were staying at the quarantine hotel.
Investigators believe there was no other transmission at the hotel.
Both guards tested positive during a routine testing.
No new cases were linked to the Delta backpacker cluster and the outbreak remains at 21 infections after the unvaccinated 25-year-old male index case travelled from Queensland in early December.