Sydney man Aude Alaskar, 27, died 'suddenly' from COVID-19 two weeks after contracting the virus

The youngest person to die from COVID-19 in Australia contracted the virus a fortnight before he suddenly deteriorated.

Aude Alaskar, a 27-year-old forklift truck driver, was in isolation with his wife, a disability worker, at their home in Liverpool in south-west Sydney.

It is believed she caught the virus first and her husband then became infected on July 21.

LIVE UPDATES: Queensland records 16 new local cases

A relative told 9News he had relatively mild symptoms until lunchtime yesterday, when he started coughing, vomiting and then collapsed.

He had not been vaccinated.

His death was announced during the daily COVID-19 press conference this morning.

"Our deepest condolences to his family and loved ones," NSW Premier Gladys Berejiklian said.

"But it demonstrates again how this disease is lethal, how it affects people of all ages."

Chief Health Officer Kerry Chant said he was being cared for by the southwestern Sydney local health district.

"He was being followed up daily by nursing staff and suddenly deteriorated," she said.

"That death is also being referred to the coroner as I understand it."

Dr Chant said the man had complained of feeling "a little fatigued" before his death.

"I think that is important to understand that your health status can deteriorate and you can have sudden death with COVID infection."

His wife has since been taken to hospital.

"He was with another person. You can imagine the trauma for that other person who has now been hospitalised. That person also had COVID," Dr Chant said this morning.

His family said he had no obvious health issues but have suggested he may have had an underlying heart condition.

A second COVID-19 death was also recorded yesterday.

A woman in her 80s from Sydney's inner west died at Royal Prince Alfred Hospital.

NSW recorded 233 new cases of COVID-19 today.