Three people associated with Portland's Kane Kennett have now tested positive for coronavirus.
His mother Melissa, her sister Joanne Saunders and Kane's girlfriend all now have COVID-19.
Kane Kennett, 24, found out he was positive to the virus on Sunday after being tested with his mother and her sister last Friday.
Kane and Melissa's test came back positive, while Ms Saunders' test was negative.
Ms Saunders then had a second test on Monday and about noon on Wednesday she was told she was now positive.
Kane's girlfriend has received similar news today.
Ms Saunders said she felt unwell on Thursday last week and had a sleep in the afternoon.
She said that despite Sunday's negative test result that she continued to feel unwell during the weekend.
Her symptoms include severe headaches and back pain, a sore throat, runny nose and diarrhea.
"I was not surprised by the result I got today," she said.
"I'm currently locked in my bedroom. My five kids have all tested negative."
Ms Saunders said she was going public to make sure that people she had been around went and got tested.
"It's the only way we can contain this virus," she said.
"If you don't feel right, don't hesitate - go and get tested.
"It's the only way we can contain coronavirus and get the Portland community back to the way it was."
A Portland mother and son, who are positive to coronavirus, have taken to social media to make sure their close contacts get tested.
Melissa Kennett said her 24-year-old son Kane only left home to pick her up from Portland hospital after she collapsed from dehydration on Monday.
She said she felt ill early Monday afternoon and on hospital staff instructions Kane drove to pick her up later in the afternoon.
"People are saying Kane has been out of our home but the only time was to pick me up," she said.
"That was on the instructions of the hospital staff.
"I went to the hospital via ambulance and the staff decided he was the most appropriate person to pick me up because we live in the same house.
"He had a mask on and never left the car.
"We both went public on Facebook to tell people we were positive, so that those who need to can get tested.
"We have been desperately trying to do the right thing."
Ms Kennett said the Australian Defence Force had been ringing each day to check she and her son were following strict quarantine guidelines.
"They ring to check at any time and we have to be here ," she said.
"We then have to go onto the system and click to check in and that shows where we are.
"We have done nothing but the right thing but there's a lot of stories going around and we just want to make our situation clear to everyone."
Ms Kennett said close contact checks had been conducted and that information had been passed on to those people, so they could self-isolate.
She said she had been told on Wednesday morning that Kane's girlfriend was also coronavirus positive.
"That information hasn't come out yet," she said.
At 11.55am: Portland District Health officials expect to be swamped by people wanting to be tested at a drive thru station at the city's hospital this morning.
Two additional positive cases have prompted enormous local interest in people wanting to being tested.
On Sunday afternoon Portland man Kane Kennett declared on social media that he had tested positive to coronavirus.
It's understood that the second positive case was a close contact of Mr Kennett.
Mr Kennett is believed to have got COVID-19 after coming into close contact with someone from Melbourne who was positive to coronavirus, while he was outside Portland.
Portland District Health chief executive officer Christine Giles declined to confirm if Mr Kennett was coronavirus positive.
But she said that was the claim he made on social media platform Facebook.
"I do know that the latest two positive people have been out and about in Portland," she said.
"They have been all around the town, been seen close to people and interacting with people.
"The close contact team has been compiling a contact list based on those two positive cases."
Ms Giles said she was greatly concerned about the potential for community transmission of COVID-19.
"I said in my post yesterday (Tuesday) that I am very worried about the amount of interaction that has been going on," she said.
"We could see community transmission going on. There are currently nine active cases in Glenelg with seven of those linked to a known outbreak.
"There have been no more positive cases linked to that outbreak for some time.
"What we are now concerned about is the potential of the new chain."
After Mr Kennett made his post on Sunday afternoon, Portland District Health was flooded with inquiries on Monday morning and again on Tuesday.
"We were just overrun with about 80 phone calls an hour. We were struggling to keep message bank empty enough to handle all the messages," she said.
The CEO said if people showed symptoms they should get tested.
Those symptoms include a runny nose, sore throat, sneezing, coughing, shortness of breath or a loss of taste.
"People with even the mildest of symptoms can be tested," Ms Giles said.
"We really want people with symptoms to get tested, not people with no symptoms.
"You need to have that viral load to show up on a test. There's only a small number of people test positive who are asymptomatic.
"People can help by isolating if they have been in close contact with a positive case and then get tested if they show symptoms.
"On Monday and yesterday we did about 100 tests each day.
"Today we opened the drive through testing facility. You don't need an appointment."
Ms Giles said the drive thru started started at 10am and it was expected that many people would want to be tested.
"The council has been helping with traffic management and I imagine that we'll be busy.
"People who see anyone out and about who should not be should contact the Police Assistance Line on 131 444 and those people can be followed up and checked on by police," she said.
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