Queensland has added 3587 infections to its COVID-19 caseload as a new indoor mask mandate comes into effect across the state.
Some 16,688 Queenslanders now have the virus with significant delays and long queues reporting at testing sites.
However, hospital numbers remain low with 112 patients in care, five of them in ICUs and none requiring ventilation.
Health authorities say testers processed almost 34,000 results in the 24 hours to 7pm on Saturday.
Queensland is 86.60 per cent fully vaccinated for everyone 16 and over.
Chief Health Officer John Gerrard says despite a jump of more than 1300 cases in a day, he's not surprised. In part, the increase is related to a change in reporting protocols which saw case figures taken from a 12-hour window on Friday.
"This number is probably a bit smaller than we had expected," he said in Brisbane on Sunday of the latest data.
"It probably (also) relates to testing over the holiday period and so it will not be a surprise at all that in the next couple of days we see a significant increase in cases as more samples are tested and more people come forward."
Two of the patients in ICU are pregnant and only one is vaccinated, he said.
Dr Gerrard said there is now clear evidence vaccination during pregnancy is "very safe".
"This reminds us that it is critical pregnant women and women who are planning to be pregnant get vaccinated," he said.
"The virus is not good for the pregnant mother or for the unborn child."
Dr Gerrard said the immune systems of pregnant women were naturally slightly suppressed, making them more susceptible to a number of different infections, including COVID-19.
"That is why it is so critical pregnant women get vaccinated."
Authorities say the virus has evolved and is now "a vastly different disease" to that which was spreading in the community last year and prior to vaccination.
"With a degree of contagiousness of this virus, we are going to be seeing very large numbers of cases, even though the severity is clearly going to be less," Dr Gerrard said.
"We are going to see very large numbers of cases and a small proportion of a very large number (who fall ill) is still a large number."
As the state tries to "slow the spread", masks were declared compulsory in "virtually all indoor spaces" in Queensland from 1am on Sunday.
Previously they were only required indoors at supermarkets, shops, on public transport and rideshare as well as airports and planes, cinemas and theatres.
They now need to be worn at workplaces unless unsafe to do so, pubs, clubs and cafes unless when seated, indoor stadiums and sporting arenas, libraries, hairdressers and nail salons, and medical centre waiting areas.
Queenslanders are also being urged to return to work-from-home arrangements where possible.