All South Australians aged between 16 and 39 will be eligible to receive the Pfizer COVID-19 vaccine from next week.
SA will become the first to include all people under 40 in the Pfizer rollout with bookings to be taken at state-run clinics from Monday.
It means all South Australians over 16 are now either eligible for either the Pfizer or Astra Zeneca jabs.
"This nation-leading move is a huge milestone in our vaccine rollout, with South Australia leading the way as the first state in the nation to open up to everyone aged 16 and older," Premier Steven Marshall said on Thursday.
"Vaccination is our pathway out of the pandemic and we are determined to ensure everyone has access to the vaccine as soon as possible to keep our state safe and economy strong."
From Monday an extra 127,000 slots will be provided in the booking system for September and October.
While on Thursday, the number of vaccine doses administered across SA is expected to hit one million.
Included in those figures are the 78 per cent of people aged over 70 who have now received at least one dose.
"Thanks to the increase in supply and massive interest from our community, we can expect to see a significant increase in the number of vaccinations delivered over the coming weeks and months," Mr Marshall said.
"More than 640,000 South Australians have rolled up their sleeves and received a vaccine, each and every one of them is protecting themselves, their families, and their community from COVID-19."
