Nerves are running high in South Australia, as the state is now only one week away from opening the doors and inevitably letting COVID in.

South Australia is leading the way for zero-COVID states, and will be the first to open its doors to people travelling from Victoria, NSW and ACT.

It has a vaccination rate that is slowly increasing and may just get to 80 per cent fully vaccinated 16+ by next week.

But on today's Coronacast, many are worried about what the future may hold.

Also on today's show:

* Good news for antibodies in breast milk

* Just because you think you had COVID, doesn't mean you did