Orange is on COVID alert after a man who has tested positive to COVID-19 visited Orange eatery, Birdie, on Sunday between 1pm-2pm.
The Summer Street establishment has had to close following the incident.
Staff at the restaurant were told to isolate on Tuesday morning after the positive case was detected.
They will need to isolate for 14 days and be tested for coronavirus.
Deputy Premier John Barilaro said the man, 18, was from Berala in Sydney.
He said he was on a camping trip and also visited Nyngan and Broken Hill.
Birdie co-owner Leah Morphett said about 25 people were in the restaurant at the time.
"They visited the bathroom as well," she said.
"We're closed for a deep clean."
She said the man was part of a small group.
"They were definitely sitting inside," she said.
Health authorities have begun contact tracing.
Anyone with symptoms is urged to get tested for the coronavirus.
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Symptoms associated with COVID include fever, cough, sore/scratchy throat, shortness of breath, runny nose, loss of taste or smell.
For advice or questions about COVID call the National Coronavirus Health Information Line on 1800 020 080.
If translating or interpreting services are needed call 131 450.
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