https://www.nytimes.com/2021/10/04/world/australia/new-zealand-covid-zero.html

For a year and a half, New Zealand has pursued a strategy of “Covid zero,” closing its borders and quickly enforcing lockdowns to keep the coronavirus in check

Prime Minister Jacinda Ardern acknowledged an end to the elimination strategy seven weeks into a lockdown that has failed to halt an outbreak of the Delta variant, announcing that restrictions would be gradually lifted in Auckland, the country’s largest city.

“With Delta, the return to zero is incredibly difficult, and our restrictions alone are not enough to achieve that quickly. In fact, for this outbreak, it’s clear that long periods of heavy restrictions has not got us to zero cases.”