On December 21, a passenger with a confirmed case of COVID-19 was on the 2.10pm flight, number ZL6469, from Sydney to Griffith.

Passengers who were on the plane are considered close contacts and must self-isolate for 14 days.

"Anyone who has symptoms should get tested immediately. Testing is available at Griffith Base Hospital," NSW Health said in a statement.

"Those without symptoms should remain in isolation and present for testing at a new pop-up clinic, which will be open from 10am to 5pm on Boxing Day, at 50-52 Yambil St, Griffith.

"Passengers must remain in isolation for the full period, even if their test is negative."

The Murrumbidgee Local Health Unit said apart from the one household they visited no other contacts have been identified in the region.

"After arriving in Griffith the person was contacted by NSW Health to advise that they had been identified as a close contact at a Sydney venue," a spokesperson said.

"They then returned to Sydney by car where they were tested and returned a positive result.

"The household they visited has been informed and is isolating."

NSW Health urges anyone in in the state with even the mildest symptoms, such as headache, fatigue, cough, sore throat or runny nose, to come forward immediately for testing, then isolate they receive a negative result.

Testing is also available on Saturday at Griffith Respiratory Clinic, 105 Binya Street Griffith

from 9 to 12.30pm and 1pm to 5pm.

Call 02 6952 1410 or visit https://www.hotdoc.com.au/.../griffith.../doctors.

To find your nearest clinic visit, visit https://www.nsw.gov.au/covid-19/how-to-protect-yourself-and-others/clinics or contact your GP.