Authorities have confirmed the first person-to-person transmission of coronavirus in Western Australia, with a sixth person testing positive for the illness.

The man, aged in his 40s, is the son of a woman who travelled from Jakarta to Perth to stay with him before continuing on to Melbourne. He tested positive at about 10am on Monday.

He is in a stable condition in self-isolation in Perth.

Three COVID-19 clinics will open in Perth on Tuesday. Credit:Lauren Pilat

It comes after a woman in her 60s has tested positive to COVID-19 earlier on Monday, after her husband returned from overseas.