NSW health officials have confirmed two new cases of COVID-19 on Sydney's Northern Beaches and have issued a warning for residents to be wary of even mild symptoms.

The infected persons are a woman in her 60s and a man in his 70s who are close contacts of each other with the source of the infections currently being investigated.

Alerts have been issued for a number of venues in both Palm Beach and Avalon Beach that were visited by the pair between December 13th-14th.