A fourth local case of COVID-19 in the Northern New South Wales Local Health District (NNSWLHD) has been confirmed by health authorities.

NNSWLHD chief executive Wayne Jones told ABC North Coast this morning that the fourth case was confirmed yesterday evening and that all cases “are doing well”.

"One is requiring care in hospital but improving dramatically,” Mr Jones told the ABC.

"The others are self-isolating at home."

Mr Jones says there are no specific locations that pose an ongoing risk to the public.

ABC North Coast also reported Mr Jones as saying that no further details relating to an individual's location will be made to the public.

"It's just ensuring that people don't worry about a particular spot,” he said. “That think that geography A is more risky than geography B, therefore I can relax.

"We want people to be vigilant everywhere they go. So, there's no value in us identifying a particular spot where a patient has turned positive, because that may, by default, make people more relaxed in other areas.

"If there is a cluster in a certain geographical area, and we believe there would be public benefit in the community knowing, we'll make that call."

Meanwhile, NSW Health is alerting passengers who were close contacts of one of the cases on Virgin Australia flight VA1141 from Sydney to Ballina, arriving 10 March 2020.

Close contacts were in rows 7 – 11.

People are advised to monitor for symptoms, and contact their GP, but call ahead first, or call healthdirect on 1800 022 222, or visit a NSW Health COVID-19 / Flu assessment clinic should they become unwell.