There are no active cases in the ACT which has gone 40 days since a diagnosis.

ACT Health confirmed on Wednesday 67,401 negative tests had been returned, including 1749 in the past 72 hours.

Due to wet weather on Wednesday, the recently opened drive-in testing clinic at Kambah was temporarily closed.

New South Wales remained on high alert as it recorded seven new cases in the 24 hours to 8pm Tuesday night.

Health authorities announced on Tuesday a security guard at a Sydney quarantine hotel had tested positive and sparked fears as they also worked at Flemington Markets while infectious.

ACT residents have been urged not to travel to Sydney or areas of NSW with active infections, unless necessary.

Residents who have recently returned tfrom hose areas should keep updated as NSW Health release information of locations infected people visited.

"We continue to ask Canberrans to reconsider their need for any unnecessary travel, particularly to areas with COVID-19. We also encourage Canberrans not to invite friends and family from Greater Sydney to the ACT at this time," ACT Health said.