The woman in her 30s, believed to be a Health Department employee, flew from the UK to a stopover in Dubai after a holiday in Iceland, before returning home to Perth on Monday on an Emirates Airbus 380 at 5.08pm local time.
The woman self-isolated in Perth as soon as she felt unwell, and authorities are confident any possible spread of the virus is contained.
The WA Health Department is assessing how many people on the flight now might need to be checked.
"There's no risk to the general public and she's being isolated at home," WA Chief Health Officer Dr Andy Robertson said.
Meanwhile, the Catholic Church in Western Australia has abandoned centuries of tradition by making changes to daily church rituals.
The measures include removing holy water vessels from churches and cathedrals.
The sign of peace handshake will also be banned, and the ceremony at the end of holy communion will stop.
Communion bread – representing the "body of Christ" – will not be placed on parishioners' tongues, and the "blood of Christ" wine will not be shared.
Source: 9News https://www.9news.com.au/national/coronavirus-australia-third-covid-19-case-in-western-australia-confirmed-in-emirates-passenger/238d6121-e896-4746-bbfe-b850494ee9e2