Coronavirus vaccines

The results come hot on the heels of similar results from Pfizer, and add to growing confidence that vaccines can help end the pandemic.

Both companies used a highly innovative and experimental approach to designing their vaccines.

Moderna says it is a "great day" and they plan to apply for approval to use the vaccine in the next few weeks.

However, this is still early data and key questions remain unanswered.

Prime Minister Scott Morrison said the country had struck two deals that would allow free doses to be rolled out in 2021 if they were approved for use.

Mr Morrison estimated the cost to be A$1.7bn (£0.9bn; $1.24bn).

Australia's 25 million people could begin receiving doses from January but there were "no guarantees", he said.

"However the agreement puts Australia at the top of the queue, if our medical experts give the vaccines the green light," the prime minister said.