The other case is a 29-year-old woman from Brisbane, who has been isolated but is now well. She travelled recently from London to Brisbane, with a short stopover in Singapore.

Contact tracing is underway in each case, which means that officials are directly contacting people who are known to have been in close contact with the two.

“If they have been in close contact with people we cannot identify or contact, the government will update the public and ask for their help to alert these people so assistance can be provided,” the Facebook post said.

Thirteen people in Queensland have been confirmed with Covid-19, including three from the Diamond Princess cruise ship.