The earlier warning for visitors to Wests New Lambton's Hopsmiths Bar has expanded to cover the entire venue between 5pm and 7.30pm on Sunday, August 2.

Anyone who was there must immediately self-isolate and seek testing.

Visitors to Sushi Revolution at Hamilton between noon and 1pm on Saturday August 1 must do the same.

The 11am update from health authorities comes after McDonald Jones Stadium and several other venues were added to Newcastle's coronavirus watch list on Thursday morning.

Hunter New England Health on Thursday confirmed it had identified another case since it raised the alert over a St Pius X student testing positive late on Wednesday evening.

The male in his 20s is a relative of that teenager, Hunter New England Health said, and the source of that infection remains under investigation.

The Bennett Hotel and Greenroof at Hamilton alerted patrons early on Thursday that they were among venues forced to close for deep cleaning.

Health authorities added Wests New Lambton's Hopsmith Sports Bar to the list, warning anyone who attended between 5pm and 7.30pm on Sunday to self-isolate immediately and seek testing.

The warning was later expanded to include all visitors to any part of Wests New Lambton between those times.

A Wests Group spokesman said health authorities told them the man had been at the Main Bar, which has been deep cleaned.

He said the venue undergoes daily fogging as a precaution.

"If you attended the Main Bar during this time please follow NSW Health guidelines," the spokesman said.

"Please self-isolate for 14 days and seek COVID-19 testing in the next two days. You will be contacted by NSW Health with more information.

"All venues continue to operate within normal trading hours, the health and safety of members and our team is our priority and we are doing everything to ensure we are CovidSAFE on a daily basis."

Patrons at several other venues have been urged to watch for symptoms and seek testing if they develop.

They include Queens Wharf Hotel between 9.30pm and 11pm on Saturday, Beaumont Street's Sydney Junction Hotel between midnight and 1.30am on Saturday and McDonald Jones Stadium from 7.30pm Sunday to the end of the Newcastle Jets match.

"The above public health recommendations follow a rigorous contact tracing process where an infected individual's movements and interactions are analysed," Hunter New England Health said in a statement.

"This enables the Public Health unit to determine if there was a reasonable chance other individuals may have been infected with the virus. In this case they would be considered a close contact and required to self-isolate until 14 days after they last saw the person or attended a place where that person visited, even if they are feeling well."

Queens Wharf Hotel told its patrons on Thursday morning that they were "yet to be contacted by Hunter New England Health and have been informed to trade as normal until told otherwise".

"It has been brought to our attention via social media that there was a possible COVID-19 case through our venue on Saturday 9.30pm-1am," the pub's operators posted on social media.

"The venue will undergo a precautionary deep clean later tonight."

Queens Wharf licencee Steve Smyth said he called Triple Zero on Thursday morning to clarify the situation after his staff found out about the case's visit through social media and alerted him.

"Everyone had heard of it before we were contacted by any authority," Mr Smyth said.

Mr Smyth said he had been advised cleaning was not required but proceeded immediately as a precaution.

"I've got a duty of care to all my staff and customers," he said.

"It's money well spent. It puts everyone's minds at ease."

Dr Kat Taylor, Public Health Controller for Hunter New England Health's COVID-19 response, said that Hunter New England Health is still working to identify any further contacts or venues visited by either of the two confirmed cases.

"It is vital people in the community continue to present for testing if experiencing symptoms to limit the spread of the virus," Dr Taylor said.

"I encourage everyone to follow directions they receive about home isolation and quarantine, and maintain COVID-safe practices of physical distancing, coughing or sneezing into their elbow, and regularly washing their hands."

Dr Taylor said the district expected a spike in testing.

Demand spiked on Monday after Wallsend Diggers, Hotel Jesmond and the Lambton Park Hotel were closed for cleaning alongside Toronto Drug Court.

"To ensure we can best serve the community during this time, we have enhanced our local testing capability," Dr Taylor said.

"In addition to expanding our call centre capacity and the number of phone lines available to improve booking wait times, we will extend hours and capacity at a number of local clinics.

"However, please be patient if visiting a clinic or calling for a booking. We have thousands of testing opportunities throughout the course of today and will see people as quickly as possible."

Walk in clinics

The John Hunter Hospital clinic, open 8am to 10pm, seven days a week. The clinic is walk in only and no appointment is required.

The Calvary Mater Newcastle clinic, open 8am to 4pm, Monday to Friday. The clinic is walk in only and no appointment is required.

The Maitland Hospital clinic, open 9am to 4pm, seven days a week. Appointment bookings are preferred, but not required, and can be made by calling 4939 2585 during operating hours.

Drive through clinics

The Belmont Hospital drive through clinic, open 8am - 4pm, seven days a week. Those wishing to be tested must contact the clinic on 4923 2211 during operating hours to arrange an appointment prior to attending.

The Cessnock Hospital drive through clinic, open 8am - 4pm, Monday to Friday, and 10am to 4pm on Saturday and Sunday. Those wishing to be tested must contact the clinic on 4991 0436 during operating hours to arrange an appointment prior to attending.

The Tomaree drive through clinic (20 Aquatic Close, Nelson Bay), open 9am to 3pm, seven days a week. Those wishing to be tested must contact the drive-through clinic on 4964 7497 to arrange an appointment prior to attending.

The University drive through clinic also continues to operate 8am to 4pm, seven days a week. Those wishing to be tested must contact the drive-through clinic on 4964 7497 during operating hours to arrange an appointment prior to attending.

Private clinics

4Cyte Pathology's COVID-19 clinic at Central Church Warners Bay (290 Hillsborough Rd), which operates between 8am and 4pm, Monday to Friday and 8am to 11am Saturdays, and no booking is required. More information can be found on their website at www.medtechservices.net.au.

Laverty's Adamstown Drive Through COVID-19 clinic (91 Victoria Street). The clinic operates between 8am and 4pm, Monday to Friday and 9am and 4pm Saturdays, and no booking is required.

Laverty's Tomaree Hospital Clinic is open from 8.30am to 3.30pm, Monday to Friday. No booking is required, but a referral from your GP is preferred prior to attending this clinic.

For a full list of clinics and booking details head here.

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