Day two into WA’s snap lockdown and no new community COVID-19 cases were recorded, raising hopes the lockdown will end as scheduled.
A record 16,490 people were tested on Monday, the start of a five-day lockdown for Perth, Peel and the South West.
“This result on day one of lockdown is an amazing number,” Premier Mark McGowan said on Tuesday.
“Thank you to everyone who came forward and got tested. You have all done your state proud.”
It comes after a security guard at the Sheraton Four Points hotel in Perth’s CBD contracted the highly-contagious UK variant of the virus, then attended more than a dozen venues over several days while infectious.
Contact tracers have now identified 151 close contacts and 68 casual contacts of the man, who is aged in his 20s and has been dubbed “case 903”.
Each of these contacts are being tested and 104 have so far returned negative results.
Genomic testing has linked his case to the same UK variant present in two recently returned overseas travellers, one of whom was accommodated on the same floor the guard was working on.
“We are advised the guard did deliver medication to the door of this particular quarantine guest,” Mr McGowan said.
“Further investigations are underway to try to track down exactly how the case was transmitted.”