New Zealand reported 14 new cases of Covid-19 a day after its largest city, Auckland, returned to lockdown.
The detection of four new infected family members earlier this week shocked a country that had not recorded any cases of local transmission for more than three months.
Of the new cases, 13 were linked to this family, while one came from abroad who was in quarantine.
A three-day lockdown was imposed on Auckland on Wednesday.
“We can see the gravity of the situation we find ourselves in,” Prime Minister Jacinda Ardern said at a press conference.
“He is treated urgently but calm and methodically. ”
New Zealand has been hailed internationally for its rapid response to the pandemic.
He again moved quickly to reimpose strict movement restrictions in Auckland and social distancing measures across the country.
Before Tuesday, New Zealand went 102 days without registering a locally transmitted Covid-19 case, one of the few countries to reach such a milestone.
Ms Ardern also said she expected the outbreak to grow further before it slows down.