The state's caseload continues to fluctuate. Numbers were below 10,000 at the beginning of last week and peaked at more than 16,000 on Thursday, while Saturday's total was 12,850.

Health officials say the majority of fresh infections are among the young, aged between 10 and 19.

Meanwhile, the number of patients in hospital is steady at 965, with 44 in intensive care. Of these, 20 are in need of ventilation.

The latest virus-related fatalities were of four women and three men, NSW Health said on Sunday. One each were aged in their 40s and 50s, two in their 70s, two in their 80s and one was in their 90s.

All of the group had received at least two vaccine doses. Two were triple-dosed and one had in fact been vaccinated four times, authorities said.

The deaths bring the state's toll since the beginning of the pandemic to 1984.

Of the latest infections, 7867 were detected using rapid antigen kits and 5226 were returned via PCR lab tests.

The state's booster vaccination coverage is still short of the levels authorities had hoped for.

Some 57 per cent of eligible adults have received a third dose, while 95.9 per cent per cent of those 16 and over have had one vaccine shot and 94.4 per cent two.

Of children aged 12-15, 83.6 per cent have received a first jab and 79.1 per cent a second. Of those 5-11, 48.3 per cent have received an initial shot.

Australian Associated Press