Wagga Independent MP Joe McGirr has tested negative and is self isolating in Wagga until he is given further advice.

"I am continuing to seek advice on the evolving COVID-19 situation and am complying with the directions coming from NSW Parliament and NSW Health," Dr McGirr said.

"I have been liaising closely with the Speaker's office since Tuesday on this matter. As a precaution, I undertook a COVID test on Wednesday afternoon. The result was negative.

"Having confirmed that MPs were permitted to return home, I made the decision to return to Wagga on Wednesday evening.

"The most recent advice to MPs today is to isolate until further advice is received. I am doing that."

Cootamundra MP Steph Cooke has tested negative for COVID-19 despite attending the same dinner in Sydney where her National Party colleague was infected.

Ms Cooke was instructed to self-isolate on Wednesday after potentially being exposed to COVID-19 in Sydney on Monday night.

Fellow Nationals MP and Agriculture Minister Adam Marshall and MLCs Trevor Khan and Ben Franklin reportedly attended a restaurant in Paddington with Ms Cooke on Monday night and are now also in isolation.

Mr Marshall revealed on Thursday morning that he had tested positive for COVID-19.

"I opened a text message from NSW Health early Wednesday morning advising me to take a Covid-19 test and to self-isolate, and I immediately did so," Ms Cooke said in a statement

"Whilst my test has since come back as negative for COVID-19, I am following the advice of NSW Health by staying in isolation and will be taking further tests in coming days."

Mr Marshall and another 30-year-old man were infected after a woman with COVID-19 attended the restaurant.

NSW Health Minister Brad Hazzard is also in isolation awaiting the results of a COVID-19 test.

The potential exposure of many more MPs, including Nationals members who attended a meeting with Mr Marshall on Tuesday, has left NSW Parliament House at a standstill.

In other news

Wagga-based Nationals MLC Wes Fang said he was awaiting advice from NSW Health which was being distributed in Parliament House by the Government Whip.

"Our instruction from the Whips is to remain in place until we have further advice.

"NSW Health will provide updated advice to the Members of Parliament on the next steps and testing shortly.

"All staff our staff have been instructed to work from home, which we have put in place."

Mr Marshall attended a Nationals post-NSW budget on Tuesday night and many guests have been advised they are close contacts of a COVID-19 infected person and must self-isolate for 14 days.

Mr Fang did not attend the dinner as he was in the upper house at the time to allow other MLCs to be absent from the chamber.

Dr McGirr did not attend the budget dinner.

NSW Premier Gladys Berejiklian, who tested negative on Thursday morning, reiterated her warning for inner Sydney residents not to leave the city.

"We do not want this virus in the regions," she said.

Shooters, Fishers and Farmers Party Murray MP Helen Dalton said there was "lots of confusion" in Parliament House and she had been forced to rely on social media as non-government MPs were not getting crucial information.

"This dreadful lack of communication puts people at risk," she said.

"I'm just following common sense - I got myself tested this morning and am self-isolating in my office.

"I'll be taking every possible precaution."

Ms Dalton has since tested negative for COVID-19.

Ms Cooke said she wanted to remind everyone of the importance of using QR code check-ins.

"This firsthand experience has told me the system is working - it is how I received advice from NSW Health so quickly.," she said.

"So please, keep checking-in at our local venues and remember to practice social distancing."

"I also want to take this opportunity to thank our health teams for the amazing work they continue to do every day throughout this COVID-19 pandemic.

"To everyone who has been in touch with me this morning, thank you for your well wishes - I truly am feeling fine and I will continue to follow the health advice, first and foremost in the interests of the health and safety of my seat of small communities."

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