A spokesperson for the NSW Department of Education confirmed a corporate employee had tested positive for COVID-19. All staff in the Redfern office were directed to immediately self-isolate and work from home while contact tracing was under way.
Dr Chant said the virus had most likely been introduced to the area very recently, as local sewage testing had not shown traces of the virus.
Genome sequencing is under way to confirm the cases are linked, and NSW Health was investigating whether any of the cases had contact with people recently returned from overseas, including air crew who may live or stay in the area.