Testing is underway to figure out where exactly the healthcare worker who tested positive contracted the virus.
"This case has transported several patients but we have identified that they also have transferred positive COVID cases," Chief Health Officer Dr Kerry Chant said.
"We are obviously doing urgent genome sequencing to confirm that that is the source of their infection and those results will be available later today."
A close contact of the worker also tested positive to the virus last night, Dr Chant said.
"A close workplace contact of this healthcare worker has come back positive since the 8pm figures and that will be included in the count for tomorrow."