A statement from Northern Tablelands MP Adam Marshall said he has been advised of the confirmation of a fourth COVID-19 case in Armidale, detected overnight.

"I am informed the individual is from the same household as the other three cases and has been in isolation since last week and throughout their period of infection, meaning they present no risk to the community," Mr Marshall said.

Armidale's COVID-19 outbreak started when two positive cases were reported last Saturday, and stay at home orders came into force at 5pm that day.

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On Sunday a third case was reported - from the same family as the first two.

At an 11am press conference, NSW Premier Gladys Berejikian said there were no new cases in the city, but the figures relied on by the premier are only updated until 8pm the previous evening.

The Armidale Express has learned the test result for the latest positive case came back after 8pm last night, so it was not included in the Premier's update.

"While any new case is not great news, this one is not unexpected," Mr Marshall said.

"What the health experts know about the Delta strain is that when one person contracts it in a household, it's almost always transmitted to every other member of that household."

With this fourth confirmed case, everyone living in that Armidale household now has COVID-19.

"This is another timely reminder for us all to keep up the good work, continue to abide by the stay-at-home order and get tested if you have even the mildest of symptoms. We cannot afford to slacken off now," Mr Marshall said.

"Take care and stay safe everyone!"

The Hunter New England region reported five new cases yesterday, none of them in the New England. The death of man in his 90s was recorded in the updated statstics.

The story is not as positive in western NSW.

Premier Berejiklian said Dubbo is becoming a "big challenge" with 25 new cases.

"The NSW government has been liaising with our federal colleagues as well to make sure that we get support to those communities in western New South Wales in far western New South Wales, and what we may need to do further in that area is being considered during the day today," she said.

NSW deputy chief health officer Dr Marianne Gale said the Dubbo outbreak was incredibly concerning.

"We are concerned about Western New South Wales, and why we are asking the residents of Western New South Wales and those LGAs that have been named, where stay at home orders are in place, to really follow the public health advice, do stay home, don't have visitors to your household, only leave your household if you have a reasonable excuse, and please come forward for testing if you have the mildest of symptoms," she said.

Health Minister Brad Hazzard said Walgett's limited health resources would struggle to respond to a major coronavirus outbreak.

"They manage in normal times but trying to manage if there is a major outbreak with a one-in-100 year virus is going to be a challenge for them," he said.

"Is it a serious issue for the local community? It is, very much so. The ICU in a hospital in a place like that is nowhere near what we would expect in Sydney."

The state government has approached the Commonwealth for additional vaccination resourcing for the Walgett community, he said.

There were two new cases in Walgett.

Across NSW, 391 people are in hospital with coronavirus, 63 of them are in intensive care, with 30 needing ventilation.

There were 390 additional coronavirus cases reported across NSW to 8pm last night.

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