The health worker was part of a health team that swabbed passengers who arrived on a flight from Auckland last Sunday.
A statement said the all the passengers and frontline workers were tested yesterday after their sixth day in quarantine.
The results came back last night with one new positive case.
The case has been transferred to the isolation ward at Motootua and is well and asymptomatic.
The health worker returned a negative test result on the third day of quarantine.
There are now 13 Covid-19 cases in managed isolation.
