The department is again urging people to remain vigilant and come forward for testing immediately if symptoms like a runny nose, scratchy throat, cough or fever appeared.
With NSW school holidays starting on Friday, testing was particularly important as more people moved around the state.
NSW Health is treating 55 COVID-19 cases, including three in intensive care, none of whom are being ventilated. Eighty-four per cent of cases being treated by NSW Health are in non-acute, out-of-hospital care.
On Monday, Premier Gladys Berejiklian repeated her message to the public to stay alert.
"Just because there are zero cases, (it) doesn't mean the virus isn't working, or that it can't come back to NSW, and certainly that is the fear," she said.
"I don't want to see us lulled into a false sense of security."
People in Australia must stay at least 1.5 metres away from others. Check your jurisdiction's restrictions on gathering limits.
If you are experiencing cold or flu symptoms, stay home and arrange a test by calling your doctor or contact the Coronavirus Health Information Hotline on 1800 020 080.
News and information is available in 63 languages at https://sbs.com.au/coronavirus
Please check the relevant guidelines for your state or territory: NSW,Victoria, Queensland, Western Australia, South Australia, Northern Territory, ACT, Tasmania