NSW recorded one new locally acquired case of COVID-19 in the 24 hours to 8pm on Friday night.
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There were also 11 cases recorded in returned travellers, bringing the total number of COVID-19 cases in NSW since the beginning of the pandemic to 4868.
There were 14,547 tests reported to 8pm on Friday night, compared with the previous day's total of 16,070.
Of the 12 new cases reported to 8pm on Friday night, one case, in a man from western Sydney, was locally acquired.
Investigations into the source of the infection are under way, but it is believed to be linked to the Berala BWS cluster.
Also, 11 were acquired overseas.
"It is very likely that COVID-19 is continuing to circulate in the community among people who have mild or no symptoms," NSW Health's Chatu Yapa said on Saturday.
"It is vital that we pick up every case of COVID-19 if we are to prevent further community transmission, and the best way we have of doing this is maintaining high testing numbers.
"Anyone who is experiencing any cold or flu-like symptoms, no matter how mild, is urged to isolate immediately, get tested and continue to isolate until a negative result is received.
"This is particularly important in areas where there have been recent cases, including western Sydney, south-west Sydney, the Northern Beaches and Wollongong."
There are more than 350 COVID-19 testing locations across NSW, many of which are open seven days a week.
To find your nearest clinic, click here or contact your GP.
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