The arrival of the highly infectious Delta variant "does raise some big questions" about New Zealand's pandemic response, a minister has said.
It comes as the country announced a further 21 confirmed cases in the latest outbreak of the virus, BBC reported.
New Zealand had gone six months without a single Covid infection.
According to Johns Hopkins University data, there have been 3,016 total confirmed cases in the country, and 26 reported deaths.
But authorities recently announced a snap lockdown after one man tested positive in Auckland with the Delta variant.