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Prime Minister Scott Morrison has urged South Australians to push the state's COVID-19 vaccination rate above 80 per cent just days after the SA opened its borders.
Taking advantage of the relaxed travel rules, the PM jetted into Adelaide on Friday, for two events in the marginal federal seat of Boothby.
Latest figures have the double-dosed rate at 79.5 per cent, putting the state close to what the prime minister said was a significant milestone.
"We can hit 80 per cent today here in South Australia," Mr Morrison said.
"So if you haven't had your second dose of the vaccination, let's go out and get that jab today."
Mr Morrison said the national plan for dealing with the virus was being realised in SA.
"We're opening safely here in South Australia so we can remain safely open," he said.
"I am going to give a big PM's challenge to South Australia. The call is out, if you haven't had your second dose, go out and get it."
Mr Morrison's call, which was later thought to have been reached, came as SA Health revealed two new virus infections on Friday and released more virus exposure sites linked to several cases in travellers from NSW and Victoria.
The new cases involved interstate travellers, one a man in his 20s and the other a woman in her 20s, but officials have stopped providing further details.
The exposure sites included a number of Qantas flights into Adelaide, a restaurant in the state's Riverland, a northern suburbs shopping centre and a separate Woolworths supermarket.
SA has five active coronavirus infections, all in hotel quarantine.
At least three of those were detected in passengers on incoming flights from Sydney and Melbourne.
Under SA's new travel rules, anyone coming into the state must be double-vaccinated and use a new online border entry process known as EntryCheck SA, which assesses an individual's vaccination status, departure location and COVID-19 risk.
Based on the information provided, travellers may also be prompted to use a new HealthCheck SA app, which will help them monitor daily symptoms and guide them through any testing and quarantine requirements.
In most cases, travellers are required to have a COVID-19 test within 72 hours of departure.
Unvaccinated travellers must get a special exemption with applications to be assessed on a case-by-case basis.