WA Premier Mark McGowan has announced a third case of COVID-19 will send the Perth and Peel region into a four-day lockdown from midnight on Monday.
He said genomic sequencing has confirmed that it is linked to the Delta variant from Sydney.
Mr McGowan said people would be required to stay home unless they were essential workers, shopping for essentials like groceries, getting medical care, or caring for the vulnerable.
Other reasons people may leave home include getting vaccinated and exercising within a 5 kilometre radius of their home.
Weddings are restricted to five people, funerals to 10 people while gyms, beauty and hair salons, casinos and nightclubs must close. Schools and daycares will stay open.
The latest case is a man in his 30s who worked and dined at Perth’s northern suburbs Indian Ocean Brewery, where the original case – a woman in her 50s from Mindarie who had visited Sydney – dined on Tuesday, June 22.
Earlier on Monday, a 32-year-old woman who attended the Mobius Health and Performance Gym in Joondalup, where a case attended, also tested positive for COVID-19.
“We’re engaging in a lockdown to kill it as soon as we can,” Mr McGowan said.
“Any new positive case is not good. What is even more concerning is this most recent infection appears to ... have involved only fleeting contact with the original case.
“We hope this will be a circuit [breaker] which will give our testers and contact tracers time to nail down a picture of how far this latest outbreak has spread.”