Despite having no underlying health issues, a double-vaccinated Covid patient in their 30s died from the virus.
The patient was one of 17 persons in NSW who died after contracting the virus in the last two days.
On Sunday, 11 patient deaths were reported, followed by six more on Monday morning.
Nine people died in their 80s, four in their 90s, two in their 70s, and one in their 50s, as well as the patient in their 30s, who was by far the youngest.
During the same time period, only three individuals died in Victoria.
It comes as officials continue to roll out a second booster for susceptible groups, while more than half a million Australians are suffering with COVID-19 infections.
In Western Australia, where the first large outbreak is still ongoing, one out of every five PCR tests is positive.
Experts say a fourth vaccination will be important in the fight to protect at-risk Australians ahead of the winter season, which is expected to see an increase in instances of the virus and influenza.
From Monday, people aged 65 and up, Indigenous Australians aged at least 50, residents of disability care facilities, and the immunocompromised will receive their fourth dose.
A total of 4.7 million people are expected to be eligible for a fourth treatment, although only about 200,000 are likely to meet the criteria at the start of the programme.
Four months following the initial booster shot, people can get a second one.
The Australian Health Protection Principal Committee predicts an infection peak in numerous states around mid-April.
The council, which is made up of chief health officers from around the country, is considering proposing that COVID-19 close contacts be released from quarantine.
It claims that isolation could be substituted by frequent quick antigen testing, wearing a mask outside the house, and restricting close contacts’ access to high-risk environments.
On Sunday, more than 47,000 new COVID-19 infections were reported across the country, with 17 virus-related deaths.
In hospital wards, about 2600 people are being treated for, with 103 of them in intensive care.