The organisers of the Sydney Royal Easter Show and Bluesfest say the coronavirus outbreak will not stop their events, despite concerts, sporting matches and other public gatherings being cancelled or curtailed overseas.

However, a growing number of other concerts and conventions in Sydney have been cancelled or postponed, and an infectious diseases expert has warned that large public events may need to be shut down to halt the spread of the deadly virus.

Organisers of the Sydney Royal Easter Show say the event will go on despite the coronavirus outbreak. Credit:James Alcock

James Wood, an associate professor at the University of NSW's School of Public Health and Community Medicine, said the time may come when major public events should be stopped.

Professor Wood said it was hard to say how many "real" cases of coronavirus were in Sydney, but "it's bound to be more than have been detected so far".