Based on the time of their symptom onset and CT score it is most likely they contracted the virus in Sydney prior to their visit to New Zealand.
Genome sequencing is underway in Australia to see if the case is linked to the current outbreak in Sydney.
This is the first time an Australian traveller has brought COVID-19 to NZ, and since gone home.
New Zealand authorities were notified by their Australian counterparts Tuesday evening and the established processes of contacting the case’s close contacts and getting further information about their movements while in Wellington was initiated.
At this stage four close contacts have been identified and are isolating. Sites of interest that were visited will be advised as further contact tracing is undertaken. People who have been at these sites will need to isolate and should contact Healthline for further advice.