Travelers receive COVID-19 tests ahead of their flights at a Histopath testing clinic at Sydney Airport in Sydney, Australia on December 7, 2021. The Omicron variant of COVID-19, first identified in southern Africa, has now been detected in countries from the US to Australia, underscoring the difficulties of curtailing contagious new strains. Photo: VCG

Australia's government said the milder impact of the Omicron strain of COVID-19 meant the country could push ahead with plans to reopen the economy even as new infections hit a record of more than 37,000 and the number of people hospitalized rose.

Record daily case numbers were reported on Monday in the states of Victoria, Queensland, South Australia and Tasmania, as well as the Australian Capital Territory.

In New South Wales, there were 20,794 cases, higher than Sunday's figure but below the daily record of 22,577 set on Saturday, with testing numbers lower over the New Year's holiday weekend.

The national daily total hit a record of more than 37,150 cases, exceeding Saturday's 35,327 cases, with Western Australia and the Northern Territory still to report.

"We have to stop thinking about case numbers and think about serious illness, living with the virus, managing our own health and ensuring that we're monitoring those symptoms and we keep our economy going," Prime Minister Scott Morrison told Channel Seven.

Hospitalizations rose to 1,204 in New South Wales, up more than 10 percent from Sunday and more than three times the level on Christmas Day.

Federal Health Minister Greg Hunt said the advice to the government was that the Omicron strain was more transmissible but also milder than other variants, which reduced the risk to both individuals and the health system.

Michael Bonning, chairman of the Australian Medical Association's New South Wales Council, said the significant increase in hospitalizations combined with the peak holiday period and the number of health workers exposed to COVID-19 were putting pressure on capacity.

"With both the Christmas period and with hospital workers being furloughed due to their close contact status.... we're finding that it is becoming quite difficult to staff, especially critical areas of hospitals," he told ABC Television.

Eight deaths from COVID-19 had been reported on Monday, taking the national toll through the pandemic to more than 2,260.