The Ministry of Health is investigating reports a person who flew into Tonga from Christchurch tested positive for Covid-19 while in Tonga's MIQ system.

A Ministry of Health spokesperson says they are investigating reports in Tongan media of a positive Covid-19 result from a person who boarded a commercial flight to Tonga from Christchurch on Wednesday.

'The case retuned a negative pre-departure test before leaving New Zealand,” they say.

'They are fully vaccinated with the Pfizer BioNTech vaccine and had their second dose on 15 October.

'They were tested in routine Day 0 testing yesterday and returned a positive result today.

The Ministry, along with the Ministry of Foreign Affairs and Trade, is working with officials in Tonga to confirm the case.

There will be further updates from the Ministry of Health on this tomorrow.