Update - March 27
The number of positive coronavirus cases related to the Lyndoch Hill winery has risen.
Previously there were two confirmed cases, both staff members at the establishment, however that has since risen to seven.
A wedding was held at the establishment recently and SA Health had been in contact with guests whose contact details had been provided by the bride and groom.
Guests who had attended and had not been contacted by SA Health were asked the South Australia COVID-19 information hotline on 1800 253 787.
If you had attended Lyndoch Hill and Barossa Chateau since March 14 and were feeling unwell, it was recommended to self isolate and contact the hotline, or the National Coronavirus Hotline on 1800 020 080.
Update - March 26
Calls are still being made to visitors to Lyndoch Hill after March 14 who are feeling unwell.
It came after the winery and SA Health confirmed two staff members had returned positive tests for COVID-19.
However there had been no new cases in the region since.
Management at Lyndoch Hill and Barossa Chateau said in a statement that the employees were "generally in good health" and had been self-isolating.
They also confirmed that six staff members had returned negative test results.
SA Health Chief Public Health Officer Nicola Spurrier encouraged visitors to the winery who were presenting respiratory symptoms or a fever to get tested.
"Because we know when you visit a winery you could be in close contact for a period of time, that is the importance of following that up," she said,
"If you suddenly think 'I might have COVID-19 because of x,y,z or because I've visited the Barossa but I have no symptoms at all', we don't want to be testing you.
"We only want to be testing people who have symptoms."
Assoc Prof Spurrier advised the public to call the National Coronavirus Hotline on 1800 020 080 to find their nearest clinic for testing, if they were presenting symptoms.
It remained unclear the origin of the outbreak at Lyndoch Hill.
Elsewhere, the number of American tourists who had tested positive to coronavirus in the Barossa had jumped from 10 to 16.
Tuesday - March 24
SA Health has issued a public announcement as investigations were underway into more coronavirus cases in the Barossa Valley.
At a press conference on Tuesday afternoon, Chief Public Health Officer Nicola Spurrier made the announcement with possible cases linked to Lyndoch Hill.
Investigations focused on a cluster of less than five people, with attentions now turned to contact tracing.
"This is important because this is something I do want to bring to the public's attention," she said.
"People who attended the winery since March 14 and who are now unwell should self-isolate and seek urgent testing."
Assoc Prof Spurrier said she could not confirm if the case was linked to the group of American tourists who were in isolation in the Barossa after they tested positive for COVID-19 late last week.
A statement from Tourism Barossa noted that the venue had followed the appropriate notification protocols with SA Health.
Further questions should be directed to SA Health or the National Coronavirus Hotline on 1800 020 080.
Updates will be provided when more information becomes available.