At least 100 people had food delivered by one of two food delivery drivers who later tested positive to coronavirus.
The two individuals were housemates of a Covid-positive hotel quarantine security guard in Perth and could have been infectious as early as April 27 before working on April 29 and 30.
All those who received food by the drivers are considered casual contacts and have been requested to get tested for Covid-19, West Australian premier Mark McGowan said on Monday.
"The 100 people to whom food was delivered are required to get tested," he told reporters.
Those dining at restaurants where food was collected by the drivers have also been encouraged to get tested.
A host of restaurants across Perth have been added to the state's extensive list of exposure sites as a. result of the work conducted by the two drivers.
Residents have been urged to continue checking the website to monitor if they need to be tested.
No new cases were announced for Western Australia on Monday, with the state still on high alert following the positive result of a guard in his 20s who worked at the Pan Pacific Hotel and tested positive on Saturday.
He worked between April 24 and 26, then on his days off from April 27 to 30, he moved through the community going shopping, seeing friends and visiting Mirrabooka Mosque.
Mr McGowan revealed a total of 58 close contacts connected to positive cases, with 26 so far returnning negative results, he told reporters on Monday.
Seventeen of the 58 attended cooking classes at the Perth College of Business and Technology on April 27 and 28, alongside one of the food delivery workers.
"We're awaiting results from the remaining, but all are in quarantine and will be for the next 14 days," Mr McGowan said.
There have so far been 217 casual contacts identified, 43 of which have returned negative results.
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