Here's what you need to know this morning.

Another high school closes

Katoomba High School in the Blue Mountains has been closed for the day after a confirmed coronavirus case — making it the fourth school in the state to lock down over the virus.

The ABC believes a staff member returned a positive test.

Students have been advised to self-isolate over the weekend while authorities trace who had contact with the person.

Secretary of the Department of Education Mark Scott said he was confident the school would re-open on Monday.

NSW prison screenings

Inmates, visitors and staff at state prisons are being screened to identify who has been overseas or had contact with a COVID-19 case over the past 14 days.

Corrective Services said prisoners and staff had been advised to take extra care with their personal hygiene and seek help if they felt unwell.

The organisation said there will also be an accelerated roll-out of flu vaccinations to staff this year.

Other measures include staff and inmates wearing protective clothing and restricting the movements of affected inmates.

Bushfire victims also the poorest

The remains of a home at Conjola Park, on the NSW south coast, after a bushfire swept through on New Year's Eve. ( ABC News; Selby Stewart )

Analysis of areas in NSW hit hardest by the 2019-20 bushfires has revealed they are also areas experiencing the highest poverty rates.

The research, from the NSW Council of Social Services and the National Centre for Social and Economic Modelling, indicates how difficult rebuilding efforts will be in some areas.

Batemans Bay has 19.5 per cent of residents in poverty, Kempsey has 19.2 per cent and Grafton 18.2 per cent.

In other regions such as Port Macquarie, Lithgow, Eurobodalla and Bega, around 15 per cent people live under the poverty line.

St Vincent's starts on-site coronavirus testing

St Vincent's Hospital in Sydney says it will start in-house testing for coronavirus from today.

Until now, the hospital was reliant on third-party pathology services.

The hospital said the measure should reduce waiting times for patients being tested for COVID-19.

A dedicated fever clinic has been set up for testing.