NSW Health said the visits took place on July 6 between 7-9pm at the Merimbula RSL Club, and on July 7 between 8.30-9.30am at Merimbula's Waterfront Café.

This case is separate to that of the COVID-19 positive Victorian teenager who stayed in Merimbula and visited the Tathra Hotel earlier this month.

At a media conference on Monday afternoon NSW Chief Health Officer Kerry Chant included the Merimbula club and cafe with a number of venues that had been identified across the state where patients had gone when they were either infectious or potentially infectious.

"The interviews have highlighted that.. either the individuals were unlikely to be infectious at these times or the nature of the contact at these venues was minimal," she said.

She said the health service was urging people who attended these venues to watch for COVID-19 symptoms, but were "not actually asking people to isolate themselves"; she said she highlighted them to ensure people were "appropriately isolating".

Dr Chant said the tourist holidaying in Merimbula had been tested for the virus in Victoria, and NSW Health was informed of the case by the Victorian Health Department on Sunday evening.

"This is a critical time where I urge you to come forward for testing," Dr Chant said.

"If you have an itchy throat, a bit of a runny nose, the mildest of symptoms, please come forward [for] testing."

Both Merimbula RSL and the Waterfront Cafe have closed for a short time for their staff to receive COVID-19 tests.