That is the latest advice from Hunter New England Health physician and public health controller Dr David Durrheim after the service station was identified as an exposure site.

"We would like to advise the community that the Coles Express service station westbound, at 14 Thomas Street in Wallsend has been identified as a COVID-19 exposure site," Dr Durrheim said.

"Anyone who attended the Coles Express between 2.45pm and 3pm on Saturday 17 July is a casual contact who must immediately get tested and self-isolate until a negative result is received.

"The service station will be closed while deep cleaning is underway."

The news comes just days after a service station at Thornton was named as a low risk COVID exposure site.

A public health alert was issued after identifying the Thornton 7-Eleven as a location of concern.

The warning was issued late Friday night and an alert placed on HNEH's Facebook page.

Anyone who attended the 7-Eleven between 12.05pm and 12.11pm on Tuesday, July 13 should get tested and self-isolate until a negative result is received.

Dr Durrheim said it was important that we all remain vigilant and comply with current restrictions.

"Anyone who has experienced fever or the recent onset of respiratory symptoms, including a cough, runny nose, shortness of breath, sore throat, or loss of taste and smell, should seek testing immediately and isolate until a negative result is returned," he said.

For a full list of new venues and transport routes of concern visit the NSW Health website.

Do you know you can subscribe to get full access to all Maitland Mercury stories? Subscribing supports us in our local news coverage. To subscribe, click here.