NSW recorded 1281 new local COVID-19 cases on Monday and five deaths.

NSW Premier Gladys Berejiklian revealed modelling by the Burnet Institute, an independent medical organisation, which showed that infections were set to peak at more than 2000 cases a day in the areas of concern in Sydney, possibly next week.

The modelling showed that the state would require its highest number of intensive care beds early in October. It is estimated that between 2,200 and 3,900 people would require hospitalisation with the total estimate peak number of people, including non-COVID patients, being 3,434 towards the end of October.

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“I do want to qualify that to say that modelling depends on a number of things; a number of variables,” Ms Berejiklian said. “If too many of us do the wrong thing, there are too many superspreading events, we could see those numbers higher.”

Ms Berejiklian said that modelling factored in the effect of the state opening its economy to the fully vaccinated.

There are 12 council areas of concern in Sydney’s south-west, south and west.