NSW Chief Health Officer Kerry Chant said information would soon be provided to the Gundagai community in relation to a coronavirus case who stopped at Oliver's Real Food Gundagai last week.

A Murrumbidgee Local Health District (MLHD) statement said the teenager visited Oliver's Real Food on Annie Pyers Drive on December 18 from 5.30pm to 6.05pm.

"Anyone who attended this venue at the specified time is considered a casual contact and must get tested and isolate until they receive a negative test result," the statement said.

"They should continue to monitor for COVID-19 symptoms and if any symptoms occur, get tested again.

"There are currently no confirmed cases of COVID-19 in the MLHD."

MLHD COVID-19 coordinator Emma Field said people who went into isolation should have another test if they later developed symptoms similar to COVID-19.

"We have put up a mobile testing clinic that is going to be put up at the Carberry Park Carpark, which is near the Visitor Information Centre in Gundagai," she said.

"To avoid delays, call our COVID hotline on 1800 831 099 for an appointment,. However, walk-in testing is also available."

Testing is also available at the Gundagai Respiratory Clinic.

The 15-year-old girl visited several exposure sites on the Northern Beaches while visiting family, before being driven home to Victoria by a parent.

On Tuesday morning, Victorian officials announced the girl had tested positive three days after isolating upon her return to the state.

Her parent has so far tested negative.

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During Victoria's daily update, the state's COVID-19 response commander Jeroen Weimar was asked if the Gundagai visit was a fuel stop or a dine-in.

"My understanding is [it was] a brief stop," he said.

Cootamundra-Gundagai mayor Abb McAlister said Olivers Real Food was predominantly a takeaway outlet and positioned out of town.

He said Gundagai's position on the highway made it more likely infected people could pass through at a time like this.

"We've got to remember we are a highway town and a lot of businesses survive on that highway traffic," he said.

Cr McAlister said in the past few days since the Northern Beaches coronavirus cluster first appeared, there had been a drastic drop in tourists passing through town and entering local businesses.

For those still driving through, he said it was important they made sure to record their names at every venue they attended, maintain hygiene and keep a safe distance from others.

"Just think of other people ... that's something for all over," he said.

Rose Misevic, owner of the nearby cafe at The Dog On The Tuckerbox, said it was "awful" the virus had come so close but based off the information available, her business had not been exposed.

She said travellers passing through to return to Victoria had dried up since last week, and it was important everyone followed all the social distancing directives they were given including staying vigilant with QR code sign-ins and sanitising.

"It's horrible and everyone's got do their best to keep safe," she said.

Should members of the public be required to act, further information will soon be published on the NSW Health website.

Pop-up coronavirus testing sites will be open in Gundagai at the following times:

Carberry Park Carpark (near the Visitor Information Centre)

Walk-in available or call 1800 831 099 to book with MLHD

Gundagai Respiratory Clinic, 134 Mount Street, South Gundagai

Call 6944 3444 to book or book online through this link.