People are seen queuing at a coronavirus disease testing site in Adelaide, Australia. Kelly Barnes/Reuters

Gulf Today Report

Australia's fifth most populous state reported one new COVID-19 case overnight. Authorities conducted mass tests on Tuesday and about 4,000 people were confined to quarantine, dampening fears of another deadly cluster emerging in a country that has largely eradicated the virus.

South Australia reimposed social distancing restrictions after detecting 21 cases of the coronavirus, most of which were acquired locally.

People are seen queuing at a COVID-19 testing site in Adelaide, Australia. Reuters

"[We have] put a lot of people, I'm talking hundreds and hundreds of people, in isolation, subjected them to a test, and at this stage, just one new infection," South Australia Premier Steven Marshall told the Australian Broadcasting Corporation.

The cases were the first local transmissions of the virus in Australia in nine days.

Australia has now recorded about 27,800 infections and 906 deaths, far fewer than many other developed nations.

Marshall said testing had identified five new cases in the past 24 hours, while 14 people were suspected to be infected and were awaiting test results.

“We are not out of the woods. We are just at the beginning stages of dealing with this particular very nasty cluster,” Marshall told reporters in Adelaide.

People are seen at a cafe after the state of Victoria saw COVID-19 case numbers drop in Melbourne.

Marshall said all cases could be traced back to an Australian who arrived in South Australia from overseas on Nov.2 and entered mandatory quarantine in a hotel.

Hotel workers are believed to have contacted the virus after touching a surface contaminated with the virus, Marshall said.

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Authorities fear the virus could have spread beyond hotel workers and their close contacts, prompting a mandate that confined about 4,000 people to their homes.

“This is a very, very worrying situation. I'm not going to underestimate the concern that I've got about this,” said Nicola Spurrier, South Australia's chief public health officer.

The bulk of the infections were in Victoria state, which forced nearly 5 million people into a stringent lockdown for more than 100 days after a surge in cases.

That outbreak has been contained, with Victoria recording no new cases for the past 16 days.