More than 7,700 tests were conducted during the COVID-19 clinic at Hunter Stadium over the past 10 days.
Public health physician David Durrheim said while he was delighted no new cases had been found, it was not time to become complacent.
"These communities have done an amazing job increasing testing rates to give us a better picture of whether the virus is currently being transmitted in the community."
"It's good news but there is a possibility the virus can be reintroduced so there is still a need for vigilance with social distancing, good hygiene and testing to continue for anyone with symptoms, especially as restrictions ease," he said.
The Broadmeadow-based clinic concluded on Sunday.
It has now been more than three weeks since The Hunter recorded a new COVID-19 case. The most likely way the virus will flare again in the region is if someone imports it.
There was one new case and another death in NSW in the past 24 hours following a weekend of relaxed restrictions.
The state government has now turned its attention to managing public transport, and says it will try to keep the trains, buses and ferries at around 20 per cent capacity as people return to work.
Only 12 people will be allowed on a regular Sydney bus, 35 people in a Waratah train carriage and 45 on a ferry under new social distancing measures.
Anyone who has experienced fever or the recent onset of respiratory symptoms, including a cough, shortness of breath or a sore throat should contact their GP, or present to their local hospital or COVID-19 clinic for testing.
