Wellington: New Zealand's Prime Minister Jacinda Ardern says there is no longer any undetected community transmission of COVID-19 as the country prepares to move out of a weeks-long nationwide lockdown at midnight Monday.

The nation's director-general of health, Dr Ashley Bloomfield, said the low number of cases "does give us confidence that we have achieved our goal of elimination".

This does not mean the virus has been stamped out - there was one new case confirmed on Monday and four probable cases – but Bloomfield said this "does mean we know where our cases are coming from".

Ardern, fronting the government's daily coronavirus update with Bloomfield, was optimistic New Zealand could "continue on a path of success".