New Zealand has announced a snap lockdown after a man tested positive for Covid, the first case in six months.

The case was detected in Auckland, which will be in lockdown for a week, while the rest of the country will be in lockdown for three days.

Authorities say they are working on the assumption that the new case was the Delta variant, BBC reported.

Just around 20% of its population has been fully vaccinated.

Coromandel, a coastal town where the infected person had visited, will be in lockdown for seven days too.

Prime Minister Jacinda Ardern said the toughest "level 4" rules were required - closing schools, offices and all businesses with only essential services remaining operational.