COVID-19 cases by likely source of infection. Publication of some data in this dataset has been suppressed (before 9 March 2020) or is being delayed because the risk of gaining information about an individual in the dataset increases as the number of cases decreases.

This dataset has been discontinued from 19 November 2021. NSW Health now reports daily COVID-19 cases as a total of local and overseas cases. With quarantine-free international travel, overseas origin of cases can no longer be determined immediately, but will be included in the NSW Health COVID-19 weekly surveillance reports.

The data is for confirmed COVID-19 cases only based on location of usual residence, not necessarily where the virus was contracted. The case definition of a confirmed case is a person who tests positive to a validated specific SARS-CoV-2 nucleic acid test or has the virus identified by electron microscopy or viral culture, at a reference laboratory. Data reported at 8pm daily.

Case counts reported by NSW Health for a particular notification date may vary over time due to ongoing investigations and the outcome of cases under review thus this dataset and any historical data contained within is subject to change on a daily basis.

The underlying dataset was assessed to measure the risk of identifying an individual and the level of sensitivity of the information gained if it was known that an individual was in the dataset. The dataset was then treated to mitigate these risks, including suppressing and aggregating data.