The ACT has recorded its fourth case of coronavirus, as the government announces a drive-through testing station to help with demand.

Key points: The fourth confirmed person with COVID-19 had recently travelled overseas

The fourth confirmed person with COVID-19 had recently travelled overseas A new drive-through testing centre for the virus will be established at EPIC

A new drive-through testing centre for the virus will be established at EPIC Only those who meet the testing criteria will be assessed for coronavirus

A test came back positive for a woman aged in her 20s who has recently returned from overseas, ACT Health has confirmed.

ACT Chief Health Officer Dr Kerryn Coleman said the woman had followed self-quarantining directions for travellers returning from overseas and is now isolating with ACT Health support.

A small number of the woman's close contacts have been identified and contacted this afternoon.

ACT Health is also working to identify those who were in close proximity to the infected woman while travelling back to Canberra, who could potentially have been exposed.

They are:

People who sat in rows 71-75 on flight QF94 from Los Angeles to Melbourne, which arrived at 8:30am on March 17.

People in rows 15-19 of QF2130 from Melbourne to Canberra, departing at noon and arriving at 1:30pm on March 17.

Canberrans who sat in these rows are being asked to quarantine themselves and to call the Communicable Disease Control Section of ACT Health on (02) 5124 9213.

Anyone else travelling on these flights in other rows are not considered to be a close contact, and as a precaution, should monitor their health until 31 March. They are not being asked to self-quarantine.

"ACT Health will be working with national authorities to identify individuals who are close contacts as a priority," a statement from the health department read.

"We are alerting any Canberrans while this work is underway."

ACT Health Minister Rachel Stephen-Smith said that the fact this woman had contracted the virus overseas aligns with the understanding that community transmission is not currently occurring in the ACT.

The two earlier cases in Canberra were both men in their 30s. Yesterday's third confirmed case was a woman in her 70s.

New testing centre to assess people in their cars

ACT Health also announced at Thursday's press conference that they are establishing a drive-through testing centre for the virus.

The drive-through centre will be located at EPIC Park in Canberra's north, and will start to assess people who meet the criteria for testing from 9:30am on Friday, March 20.

Ms Stephen-Smith said the new centre would speed up the testing process, and is designed to complement the current testing centre at the walk-in clinic in Weston Creek.

"Here we are introducing what is effectively a drive-through respiratory assessment centre," Ms Stephen-Smith said.

"You'll drive up, you'll be assessed by a nurse … and self-isolate until you get your result back."

Ms Stephen-Smith said people would be required to remain in their cars as they were tested, which would assist in protecting health workers from being exposed to COVID-19.

Those who drive-up will be asked if they meet the criteria, and then proceed through to a dedicated testing area.

People have to stay in their cars while the testing takes place. ( ABC News: Tom Maddocks )

Ms Stephen-Smith said the process, which should not take more then 20 minutes, had proven to be efficient in other jurisdictions.

"It's very convenient for people, but it also provides that element of additional protection for our healthcare workers," she said.

She made clear that the criteria for testing had not changed: it remains defined as being only those with symptoms of coronavirus — including fever, dry cough, headache and sore throat — who have also travelled within the last 14 days or who have come into contact with an infected person.

Those who arrive who do not meet the criteria will be turned away.

Restrictions placed on hospital visitors

New restrictions are also being placed on visitors at Canberra's major public hospitals, in an effort to protect vulnerable patients from coronavirus.

From today, patients will be allowed only one visitor at a time, and anyone with flu-like symptoms will be refused access.

Anyone with appointments in outpatient clinics have also been asked not to bring people in with them unless absolutely necessary.

The restrictions apply at the Canberra Hospital, Calvary, and the University of Canberra Hospital.

However, Dr Sanjaya Senanayake from Canberra Health Services says exceptions can be made where appropriate.

"If someone is extremely unwell, and on their last legs, of course we will try and accommodate family," he said.

"Or if there's a child who needs to visit a sick parent, of course we're going to accommodate people.

"But we're just trying to get that sense of social distancing not just within the community, but within the hospital."

Almost 1,900 people have been tested in the ACT for coronavirus so far, but only a small number have tested positive.

Ms Stephen-Smith said that was proof that community transmission is not occurring.

Health workers who come into contact with infected people are also being tested, Ms Stephen Smith said.

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Coles ram raid unrelated to coronavirus panic buying

Meanwhile, a ram raid at a supermarket in Curtin on Wednesday night was not connected to coronavirus panic buying, ACT Policing said.

The front entrance of the Coles supermarket in Canberra's south was smashed in, with the car's paint staining the door. Police said the offenders were after cigarettes, but left empty handed.

The entrance was blocked off Thursday morning by a single shopping trolley. But despite the damage, the store still opened at 7am for elderly customers, with other shoppers queuing outside.