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Fans who watched US band Tool in New Zealand last week have been warned they may have been exposed to coronavirus.

A man in his 30s, who attended the gig in Auckland's Spark Arena, has been confirmed as the nation's fourth case of the virus.

"He was in the general admission standing area in the front left-hand quadrant," said health officials.

They added the risk of catching the virus was "low" but advised audience members to be aware of the symptoms.

The man, who had recently arrived back in the country from northern Italy, has been isolated at home since Wednesday. His partner was announced as New Zealand's second case earlier this week.

At present, it is not known how Covid-19 spreads from person to person, but similar viruses do so via droplets, such as those produced when an infected person coughs or sneezes.

The current NHS advice is to avoid "close contact" with anyone who has the virus.

New Zealand's director-general of health Dr Ashley Bloomfield said fans in the vicinity of the man at the Tool concert were considered "casual contacts".

"They are at low risk and the appropriate action for them is to just be aware of the symptoms [and] call healthline if they are concerned or if they have any symptoms," he said.

Concerts cancelled

Concerns about coronavirus are disrupting the whole entertainment industry, with the release of the new James Bond film postponed until November, and the International Indian Film Academy Awards, known as Bollywood's Oscars, called off.

Artists including BTS, Mariah Carey, Mabel, Khalid, Pixies, Foals Green Day and Stormzy have also delayed or cancelled concerts, with dates in Asia particularly affected.

Representatives of the EBU, which organises the Eurovision Song Contest, have said they will be unable to attend a meeting of the 41 participating countries next week after a staff member tested positive for the virus.

While the contest itself is not currently in jeopardy, the EBU says it will "monitor the situation and assess the potential of the impact of coronavirus on its events".

Meanwhile, Universal Music has advised its employees not to attend the upcoming South By Southwest music festival in Austin, Texas - which is one of the industry's key showcases for new talent.

Sony and Warner Music have both instituted similar bans, according to Variety magazine.

Artists playing the festival are not affected, although scheduled appearances by Trent Reznor and the Beastie Boys have been cancelled after the companies promoting the films they were connected to pulled out.

Laura Jane Grace, frontwoman of the punk band Against Me! said artists weren't always in control of whether or not shows would go ahead.

"All the bands cancelling shows because of coronavirus are doing so because their insurance companies updated their policies to not cover cancellations due to the virus," she wrote on Twitter.

"I know because ours did the same."