NSW’s Chief Health Officer says authorities are anticipating as many as 1.5 million people in the state to be infected with COVID-19, as hospitals prepare for an outbreak to converge with flu season.

Dr Kerry Chant said the "best evidence" from modelling of the impact of the disease means health authorities were "anticipating 20 per cent of the first wave [of NSW] to be infected".

Premier Gladys Berejiklian said events like the Sydney Royal Easter Show would not be cancelled at this stage, but that decision could change.

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