The six-day lockdown in South Australia to contain COVID-19 cases has improved Adelaide's chances of remaining the venue of the first Day/Night Test between India and Australia from December 17 even though the situation remains fluid, the state's top medical officer has said.

South Australia has closed its borders after a sudden surge in COVID-19 positive cases, which stand at an overall 551 right now, and cricketers, including Test skipper Tim Paine, have been airlifted to New South Wales. South Australia's chief public health officer Nicola Spurrier, during a press conference, admitted that there are no guarantees.