The New England's first coronavirus case in almost a year is a "wake-up call" for the region, said Glen Innes mayor Carol Sparks.

Hunter New England Health confirmed on Sunday that the Glen Innes Severn local government area was the site of the region's first coronavirus case in 326 days.

Public health authorities were quick to reassure the community the infected person, a man in his 30s, was not considered a public health risk because he had been in self-isolation since his return home to the area.

The man contracted COVID-19 at the Granites gold mine in the Tanami Desert in the Northern Territory.

Glen Innes Mayor Carol Sparks said the new case was a "wake-up call".

She urged the region's residents to stay at home as much as they possibly could in coming days and weeks.

"We just have to be very cautious and keep to the health standards, wash your hands and basically stay at home until we get the all clear," she said. "I'd just encourage everyone to stay at home."

Cr Sparks said the local health service has relatively limited capacity to deal with serious coronavirus cases.

The town's hospital has limited access to visiting medical officers to work in its emergency room.

"We know that we only have limited ventilators here. Two probably usable at the most," she said.

"We would be relying on other health services to look after us. So if anybody gets a serious infection they'll have to be shipped out of town."

Fortunately, the community's most vulnerable people are largely protected, with local doctors reporting widespread vaccination.

Glen Innes doctor, Peter Annetts, said his clinic had been able to offer a vaccine to all their patients down to the age of 60 to 65.

"The vaccination program has taken a lot of work, it's been an incredible effort from our staff because it's all on top of what we normally do and we're already overworked, so it's taken its toll on our staff, but they've all done a great job," he said.

"Basically, it's like contact tracing.

"We have to phone them up and book them in - it's been a big effort. We've basically got through the people that we had to get through, which is the over 70s.

"They're starting our second doses on the third of July.

"All the staff that are doing it are doing it to protect the community."

Residents of Greater Sydney, Blue Mountains, Central Coast, Shellharbour and Wollongong went into a two-week lockdown at 6pm on Saturday, as a result of an 80-case coronavirus outbreak in the state's capital.

All residents of NSW, including regional areas, became subject to additional restrictions, including a mask mandate, social distancing obligations and more.

NSW reported 30 new coronavirus cases on Sunday.