South Australia is on high alert for a coronavirus outbreak when a prison worker became the fourth person to become infected outside hotel quarantine on Sunday.
The outbreak has spread to a large family with members working in high-risk quarantine hotels, elderly and health care providers, and prison.
Hundreds of people in the northern suburbs of Adelaide may be exposed to the virus in the cluster, which marks the first community transmission in South Australia since April 15.
A worker at Yatala Labor Prison (pictured) in north Adelaide tested positive on Sunday
Elementary and preschool in Mawson Lakes, north Adelaide (pictured) is closed for cleaning on Monday after a student was found to be in close contact with an infected person
People wait in their cars at a coronavirus testing clinic in Victoria Park in Adelaide in September. South Australia fears the new cluster will spread as more people show symptoms
A South Australian Correctional Services employee from Yatala Labor Prison in Adelaide's northern suburbs has tested positive, SA Correctional Services chief executive David Brown told ABC News on Sunday.
A responsive team helps track contacts in prison.
Less than an hour later, Mawson Lakes Primary School and Preschool, also in north Adelaide, announced that they would be closing for a thorough clean on Monday after it was discovered that a student was in close contact with an infected person.
Lyell McEwin Hospital in north Adelaide, where the woman was diagnosed in the eighties
After an emergency meeting on Sunday, WA tightened its borders with South Australia again. Pictured: SA passenger arrives at Perth Airport on Saturday. The restrictions were relaxed for a day
Testing in South Australia's Barossa Valley in March.
SA Health had reported earlier on Sunday that a quarantined hotel worker had infected two family members.
Health officials are urgently seeking contact information for the woman in her eighties who was diagnosed on Saturday at Lyell McEwin Hospital in north Adelaide.
The woman, aged 80, was wearing a mask in the hospital, but about 90 people who were in the emergency room at the same time on Friday evening and early Saturday morning had to be quarantined as close contacts.
These new cases, the first locally acquired infections in South Africa since April, sparked fears of a Melbourne-like blast from a hotel quarantine breach.
A married couple who were related to the older woman also tested positive on Sunday – a woman in their fifties and a man in their sixties.
"One of those people works in our Medi-Hotels," Professor Nicola Spurrier, South Australia's chief public health officer, told reporters on Sunday.
"Here we look at the source."
The Medi-Hotel was later called Peppers.
From Sunday, all employees and guests in quarantine hotels must be tested for coronavirus every week, said Professor Spurrier.
One of the infected couples was a child of the elderly woman who is in stable condition in the hospital.
Professor Spurrier called the new cases "very worrying".
The infected patients have "a very large family," she told reporters on Sunday, and four close contacts have shown symptoms and are now waiting for the results of the Covid-19 test.
South Australia fears a coronavirus outbreak the day after the border with WA opens. Pictured: People receiving coronavirus tests in Victoria Park, Adelaide on September 6
Pictured: Coronavirus testing in Adelaide in July. South Australian authorities are concerned that the trio diagnosed on Sunday have large families, four of whom are showing symptoms
Professor Spurrier also said the elderly woman visited Parafield Plaza Asian supermarket between 10:30 am and 11:30 am on Thursday while she was contagious.
She said it was too early to say if people had been exposed at the Adelaide Oval Christmas Pageant on Saturday.
She urged all South Australians with symptoms to get tested immediately.
An overseas traveler was also diagnosed with coronavirus on Sunday, resulting in a total of four new cases.
Professor Nicola Spurrier, Chief Public Health Officer of South Australia, pictured in May
The 30-year-old man is in hotel quarantine.
The infections were diagnosed for the first time in months the day after Western Australia first opened to South Australia.
Motorists were queuing at the South Australian border when Western Australia eased the tough border closure on Saturday.
According to the newly relaxed rules of Western Australia, only travelers from Victoria and NSW need to self-isolate on day 11 and have a coronavirus test carried out.
Due to the burgeoning South Australian cluster, the Police Commissioner, Prime Minister and Chief Health Officer of Western Australia held an emergency meeting on Sunday.
The relaxed border has now been lifted as officials made the quick decision to test anyone arriving at Perth airport or on the road from South Australia and make them self-isolate for 14 days, ABC News reported.
Western Australian health officials will now also be reaching out to anyone who traveled in from South Australia yesterday when the borders relaxed and telling them to be tested for coronavirus and isolate until they get the results.
South Australia had previously recorded nine locally acquired coronavirus cases, the last occurring on April 15.
The new cases in South Australia have also raised fears that a planned reopening of the border with Victoria may not take place on December 1.
Victorians traveling to South Australia would no longer need to be quarantined for 14 days after that date.
Coronavirus in South Australia hit a total of 526 cases on Sunday, 19 of which are now active infections.
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