Anyone who visited Salamander Bay Shopping Centre last Wednesday is urged to watch for COVID-19 symptoms after a positive case in Port Stephens.
Hunter New England Health (HNeH) said a man in his 60s, who is now in isolation, had tested positive after contracting the virus off a visitor from Sydney.
The Port Stephens man was at the shopping centre on July 15.
The Sydney visitor also attended the Windsor Castle Hotel in East Maitland between 6-8 pm on Monday, July 13.
HNEH public health controller Dr David Durrheim said people who were at the locations during the outlined times "must be tested for COVID-19 even if you have the mildest of respiratory symptoms".
"Anyone with cold or flu-like symptoms such as fever, sore throat, cough or shortness of breath, is urged to get tested," he said.
"Even those with mild symptoms such as fatigue, new muscle aches or pains, a change in taste or smell or a new runny nose are encouraged to arrange testing."
Additional staff have been deployed to Tomaree Community Hospital COVID-19 clinic to increase testing capability.
Testing is also available at the Maitland Hospital walk-in clinic or through a local GP.
A spokesman for the Windsor Castle Hotel said management had been advised by Hunter New England Health on Tuesday afternoon.
He said the health authority had advised that "no further action" needed to be taken.