The number of confirmed cases of coronavirus in Australia has risen to 12 after a couple was tested in South Australia.

"Two novel coronavirus cases have been confirmed in SA in a 60-year-old male and a 60-year-old female," SA Health tweeted.

"They will both be in isolation at the RAH (Royal Adelaide Hospital) and are currently in a stable condition."

The couple who hail from the Chinese city of Wuhan, the epicentre of the outbreak, had been visiting family in South Australia.