The Murrumbidgee Local Health District [MLHD] is expecting a rise in COVID-19 cases after six new detections were announced across three local government areas on Thursday.
Single cases were found in the Edward River and Albury local government areas [LGAs] on Wednesday, and another four were found after the 8pm deadline for daily reports.
The new infections - three in the Albury LGA and one in Greater Hume - will be counted in Friday's official tally.
Two confirmed cases had attended popular Albury nightspot Zed Bar, which has been listed as a casual contact venue between 5.30pm and 11.15pm on Friday.
MLHD public health director Tracey Oakman said one person attended the venue while infectious, and another has since tested positive to the virus.
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"They were infectious while they were at Zed Bar, so they caught it somewhere else and we haven't identified what the source is at this point," Ms Oakman said.
"It may not have been from our area, or it may have been someone from outside our area who was here briefly and left."
While people who were at the venue at the specified times are automatically determined casual contacts, further investigations could see some patrons upgraded to close contacts, Ms Oakman said.
The Edward River case is a household contact of a previously confirmed case and has been in isolation.
"It's timely to remind people, the virus is in Albury, it's in Wodonga, it's in our local region," Ms Oakman reiterated.
"Please, if you have any symptoms at all get tested.
"That was what prompted our first case to get tested, because she was symptomatic, and had not identified that she'd been in contact with a known case. So it is up to the public to recognise that you've got some sort of symptoms and to get tested."
Investigations into the Albury confirmed positives are continuing and more virus detections and exposure sites are expected. They come from multiple households and cover "a range of ages".
"We do know that one case we've investigated so far has been infectious for one day in the community, and the one [on Wednesday] was also infectious for several days in the community," Ms Oakman said.
"In all honestly there's probably going to be more cases as well, so please be vigilant everyone."
Sewage surveillance has returned positive results for fragments of the virus in treatment plants at Jerilderie, in the southern Riverina, and Lake Cargelligo, in the north-west. It was also found in testing at the West Wyalong on Wednesday.
The MLHD has also moved to allay fears of further exposure sites going unlisted following the detection of a positive case at the weekend.
A new case was announced for Griffith on Sunday, in a resident from outside the district who has since left.
"The [MLHD] can confirm there are no new locations of concern associated with a person who tested positive to COVID-19 in Griffith," the authority said in a statement.
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