Queensland Chief Health Officer Dr Peter Aitken said the decision followed the detection of multiple COVID-19 cases connected to a school reunion in Adelaide, and multiple high risk exposure sites being linked to those cases.
SA Premier Steven Marshall indicated travellers from NSW, Victoria and the ACT could soon find themselves locked out of SA, only days after they were welcomed back for the first time in months.
“It may become necessary. I hope it doesn’t,” he said in a press conference on Saturday morning.
“We would only do that if we wanted to make sure that we still enjoy a Christmas here in SA. This is a balancing act.”
Instead of announcing immediate changes to the border regime, Mr Marshall said the state’s COVID-19 directions committee had decided to require all arrivals from NSW, Victoria and the ACT be tested upon arrival.
They must isolate until a negative result is received, and be tested again on day six of their visit to SA.
The new rules are in addition to a requirement for travellers from those states to present proof of a negative test undertaken up to 72 hours before their arrival.
“We’re going to put as many speed bumps in the way of the Omicron variant while we gather more information as to whether or not this really is a very different situation going forward,” he said.
The premier rejected suggestions the government was being indecisive on borders.
The state is managing the transmission of the Delta COVID-19 variant as expected, but Omicron is a “game changer” he said.
“This has got nothing to do with Delta it has got everything to do with the Omicron variant,” Mr Marshall said.
“We remain extraordinarily concerned about the Omicron threat.”
Chief Public Health Officer Professor Nicola Spurrier said the health team is particularly concerned about vaccine efficacy against the new strain, the severity of the variant, and high rates of reinfection observed abroad.
Concerns over suspected community transmission in Sydney, and the ability for overseas arrivals to make their way into SA also remain.
Some other jurisdictions only require international arrivals to quarantine for 72 hours, or allow them to immediately travel to other places in Australia.
Under current rules, all international arrivals in SA must quarantine for 14 days.
South Australia this week reported its largest single-day tally for more than a year, with the current outbreak forcing the governor and the opposition leader into isolation.