People who attended the Regal Medical Centre in Mittagong between Monday and Friday of last week are being urged to get a covid test.
It comes after two health professionals, a doctor and a nurse tested positive.
It's possible they caught the virus from a patient who didn't known they had it.
The centre is trying to get in touch with up to 200 people who maybe affected.
They're being asked to not to see a doctor or chemist, but get tested and isolate until they get their results.