The 58-year-old was supposed to be leading the Adelaide Symphony Orchestra in a concert at the Adelaide Festival on Saturday night, but he came down with a sickness.
Now it has been confirmed the Brisbane-born musician has tested positive for COVID-19.
“He spent two nights before he went into hospital, but he was feeling unwell so he never made it into rehearsal with the symphony orchestra, so he’s not been in touch with the orchestra,” Adelaide Festival executive director Rob Brookman told ABC Radio.
The Sound of History concert performance will go ahead in Mr Dean’s absence, who will be replaced by composer Richard Mills.
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His agency Intermusica said he is currently receiving treatment in hospital in Adelaide.
“Intermusica, along with Brett’s publishers Boosey and Hawkes, have taken the necessary steps to inform all those who have worked with Brett in the last 14 days, further to NHS advice and SA Health.
“Our thoughts are with Brett at this difficult time and we wish him well in his recovery.”
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SA Health yesterday said there had been seven cases of coronavirus in South Australia, including that of a 58-year-old who arrived in Adelaide from Taiwan.
He performed at the National Symphony Orchestra in Taipei, Taiwan last Friday.
The three people Mr Dean has been in contact with in Adelaide in recent days are now in voluntary self-quarantine but have not developed any symptoms of the deadly virus, according to a statement on the festival website.
He travelled to Adelaide on Tuesday via Brisbane.
The flight details of four recent confirmed COVID-19 cases in South Australia have been identified. Please call the Communicable Disease Control Branch on 1300 232 272 if you were on any of these flights. pic.twitter.com/B1CqQ8Im0W
— SA Health (@SAHealth) March 5, 2020
The most common symptoms of COVID-19 are fever, tiredness and dry cough, according to the World Health Organisation, and can take up to 14 days to develop.
Some people may also experience aches and pains, nasal congestion, runny nose, sore throat or diarrhoea.
Anyone who has been to China, Iran or South Korea, or in contact with a person infected with coronavirus, should immediately isolate themselves from other people.
And if they start to experience symptoms, they should phone their GP or local emergency department.