The local government areas of Bogan, Bourke, Brewarrina, Coonamble, Gilgandra, Narromine, Walgett and Warren went into a week-long lockdown at 7pm on Wednesday, after a 27-year-old man from Walgett tested positive to COVID.

Corrective Services NSW confirmed the man had arrived at Bathurst Correctional Centre on Saturday and was COVID-tested as part of the department's protocols. He was released on bail on Monday before returning a positive test on Wednesday.

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Western NSW Health said the man was also known to have been in Dubbo and Bathurst during his infectious period.

Investigations and contact tracing are under way.

NSW Local Health District chief executive Scott McLachlan announced on Thursday a priority dosage of Pfizer vaccinations would be transported to Walgett.

"Today we took a delivery of five trays of Pfizer, now that's the biggest delivery we've ever seen in western NSW and that's been fast-tracked to help us increase the vaccination in western NSW, but particularly in Walgett," he said.

"We're also sending a team of 10 people up to Walgett tomorrow to help us fast-track vaccinations with Pfizer with the Walgett community."

Mr McLachlan said 37 per cent of the community had received their first vaccination, and about 17 per cent had their second. But unfortunately it was less than half that rate for the Aboriginal communities across western NSW.

He said now was the time for the Aboriginal community to "step up and rally".

"That worries us terribly, it is our absolute priority to help protect our most vulnerable communities," he said.

"I would say to Aboriginal people and mobs around the region both vaccines are absolutely safe and effective.

"Both AstraZeneca and Pfizer are available locally at Aboriginal medical services, GPs, pharmacies."

Three new COVID-19 cases were recorded in Dubbo on Thursday morning, bringing the number of cases in western NSW to six.

NSW deputy chief health officer Dr Marianne Gale said she wanted to make a "specific callout" to Aboriginal communities.

"We know that many of those affected areas have a high proportion of Aboriginal people, and I ask all our Aboriginal communities to stay at home, come forward for a test if you have symptoms and, of course, get vaccinated with any available vaccine as soon as possible," she said.

NSW Premier Gladys Berejiklian said officials would be working to boost vaccination rates and supply in Indigenous communities in the area.

"We have been looking at that, and of course those communities would have had access to vaccination earlier on. But we are making sure we have sufficient vaccine to provide those vulnerable communities and working with those communities in western NSW."

The state Member for Barwon, Roy Butler said the region couldn't take any chances because the healthcare system in rural NSW was so poor.

"We have very limited services in our regional communities," he said.

"All of the river towns have a similar makeup like that, with limited health services and huge Aboriginal populations, which presents a massive risk."

"Culturally it's an absolutely appropriate novel for Aboriginal families to gather, to get together. It's part of how they work and what they do. At the moment it's going to be incredibly hard for those families to not be able to get together like they normally would.

Mr Butler said he supported the stay-at-home order decision, as there were limited alternatives for these vulnerable communities, but said he was concerned about the impact it would have on businesses and trade.

"We're only just coming out of the impact of the drought, and finally seeing some green shoots of good economic activity, which is going to now be crippled for at least a week," he said.