A Samoan sailor who returned on a repatriation flight from Auckland last week tested positive for the coronavirus on Wednesday night despite previously testing negative.
A subsequent test also came back negative but samples have been sent to New Zealand for confirmation.
Samoa's Director General of Health Leusa Dr Take Naseri said the sample left on Air New Zealand's weekly cargo flight on Friday afternoon.
He said the swab would be transported from Auckland Airport directly to the ESR Lab in Wellington for testing, with a blood sample to follow.