What we know about COVID immunity after infection

The great public health battle of our time is fast-paced and complex with variants and vaccines still evolving. Stephen Kent explains some of the successes and challenges.

Borders stay open - despite SA Health recommendation to close

The SA Government has opted against reimposing hard border restrictions on the eastern states – despite conceding it was advised to do so by the state’s chief public health officer – but will impose new “speed bumps” on people entering South Australia.

A SARS CoV-2 Rapid Antigen Test being used in Canberra last month. The tests are available for sale in supermarkets and pharmacies in most states and territories. Photo: AAP/Lukas Coch

SA's rapid antigen test ban needs a rapid rethink

Confirmed community transmission COVID-19 cases in Adelaide mean it’s now time for SA Health to lift its ban on over-the-counter detection kits, argues Jodie van Deventer.

SA booster shot rollout begins

The rollout of COVID-19 booster shots in South Australia’s state-run clinics begins today, as health authorities examine whether to bring forward third doses of the vaccine to combat the Omicron variant.

When will we reach herd immunity?

High vaccination rates are key but it’s hard to pin a number down, explain Julie Leask and James Wood.

Fast and loose: Delta variant leads contact tracers on grim chase

The COVID-19 variant which has sparked lockdown in South Australia and interstate is transmitted so much faster than before that authorities struggle to keep up, writes C Raina MacIntyre.