There was only one case of COVID-19 detected in NSW in the 24 hours to 8pm on Tuesday, in a child who was a household contact of an existing case.
Premier Gladys Berejiklian said this was a pleasing result, and also announced that two previously unlinked Mount Druitt cases has been connected to the Berala cluster.
"We haven't identified the source but the genomic testing has linked them to the Berala cluster," she said. "We are definitely in the mop-up stage."
There were roughly 20,600 people tested in the 24 hours to 8pm, and six cases in overseas travellers
Ms Berejiklian also spoke about the rollout of the COVID-19 vaccine, which has been in the spotlight as the Federal Government works to start administering it to priority groups next month.
Ms Berejiklian said people should strongly consider having the vaccine whenever it was available to them - adding she would be keen to have it herself as soon as possible - but warned that its rollout did not mean the community could let down its guard.
She said some level of restrictions and social distancing would remain in place for some time, with NSW residents needed to learn to "live with the virus".
"Once the vaccine begins to rollout, it does not mean we stop being COVID safe," she said. "Just because some people in the community, whether it is a small number or large number, will have taken the vaccine, does not mean the rest of us can relax. We have to stay COVID safe for a while longer, we don't know when that end date is."
On Wednesday, there was debate over the use of the AstraZeneca vaccine - to be the main vaccine used in Australia - with the Australian and New Zealand Society for Immunology telling Nine Newspapers the federal government should pause its planned rollout because it may not be effective enough to generate herd immunity.
The society said some clinical trials of the vaccine showed it was only 62 per cent effective when given in the recommended dose, whereas trials suggested vaccines from Pfizer and Moderna were about 95 per cent effective.
However, Australian health officials say the country should use all resources available to control the spread of COVID-19 and have urged people to look at all the information.
The government has secured 53.8 million doses of the AstraZeneca vaccine, with two injections required per person.
It will administer the Pfizer vaccine - which Australia has bought for 5 million people - to "first priority groups" like quarantine and border workers, front line health workers and aged care and disability staff and residents.