A person who attended the Golden Plains music festival south-west of Melbourne at the weekend has tested positive for COVID-19.

Key points: It is believed the person had recently been overseas and became unwell at the festival on Sunday

It is believed the person had recently been overseas and became unwell at the festival on Sunday Around 12,000 people attended the three-day music event

Around 12,000 people attended the three-day music event Earlier, Golden Plains headline act The Pixies announced they would postpone the rest of their tour "out of caution for current public health concerns"

It is believed the person recently returned from overseas and attended the festival on Sunday, before they developed symptoms and were diagnosed with the virus days later.

Victorian Health Minister Jenny Mikakos told a press conference that one person who attended the festival, near the small town of Meredith, had tested positive.

"In terms of the Golden Plains music festival, I understand now we've had one person who has been diagnosed … for COVID-19," she said.

Around 12,000 people bought tickets for the outdoor music and camping event on March 7, 8 and 9.

The Department of Health and Human Services later said the person was not unwell at the event, and no further action was required by organisers.

The Golden Plains festival is held in a natural amphitheatre at Meredith and has just one stage. ( Supplied: Theresa Harrison )

Headline act postpones tour

Golden Plains headline act, The Pixies, have postponed the rest of their Australian tour.

In a statement released on Thursday the band said: "Out of caution for current public health concerns, Pixies are postponing their remaining Australian shows in Brisbane, Sydney and Perth."

"This was an extremely difficult decision, but the wellbeing of our fans is always our top priority."

Festival organisers sent out an email before the event, encouraging people to clean their hands thoroughly and often, especially before eating and after going to the bathroom.

They also asked anyone with a viral or bacterial illness to stay at home.

Hand sanitiser was widely available at the festival.

Meanwhile, the state's health department confirmed the T20 Cricket World Cup Final at the MCG on Sunday was now considered a public exposure site for COVID-19.

Anyone who attended the MCC Members on Level 2 should monitor their health over the next 10 days and seek medical advice if they become unwell.

On Wednesday it was announced Tasmania's Dark Mofo winter arts festival had been cancelled because of coronavirus.

Organisers said they made the decision three months out from the June event because a last minute cancellation would have cost millions and likely ended the festival permanently.

Miley Cyrus also pulled out of her trip to Australia, prompting the cancellation of a bushfire benefit concert.

The huge Coachella festival in California has been postponed until October.