Murrumbidgee health authorities say they are concerned about another coronavirus outbreak but hope the region can avoid a second lockdown.
Murrumbidgee Local Health District chief executive Jill Ludford confirmed there had been a new case identified in Albury last night.
Residents have been warned that someone infected with COVID-19 dined at Albury's Cafe Borellas at lunchtime on June 30
Another person known to have the virus visited the Murray Downs Golf Club on July 4 and 5.
The region now has for confirmed coronavirus cases, three of whom are in Albury.
The other case is a Snowy Valleys resident who has returned from overseas and is in quarantine in a Sydney hotel.
"We have always known after the restrictions eased that we lived in an environment where there was a possibility of a spike or an outbreak," Ms Ludford said.
"We've now seen 4 new cases arrive in our region ... which is really reflecting some of the outbreaks and the spikes in other parts of the country."
Ms Ludford said anyone who visited Cafe Borellas on June 30 or Murray Downs Golf Club on July 4 or 5 should come forward for testing.
"It's really important that people don't wait for symptoms if they've been in those venues. We'd really like anyone who's been in those venues to please come forward for testing even if you're asymptomatic," she said.
NSW Health senior environmental health officer Tony Burns said contact tracing would be critical in preventing another lockdown.
"The information that is kept by premises is so critical for us to be able to then go back and see who were at a particular venue at a particular time and date to enable us to follow up with them," he said.
Ms Ludford said the Murrumbidgee's proximity to the main thoroughfare between the Border and Sydney posed a risk for transmission.
"We have the Hume Highway running through our region, and we also have a lot of areas where we have travellers going through with caravans heading north at this time of year," she said.
"We remain concerned and we also are really keen to make sure that every individual in the community understands the risk that we're all living under and we can't afford to drop our guard."
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