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New Zealand has fared better than other countries when it comes to coronavirus, recording 1,220 confirmed cases and 22 deaths since the virus arrived in late February 2020.

Having introduced lockdown early on and restricted its air and sea connections with the outside world, New Zealand recently passed a milestone of 100 days without a case.

But on 10 August that happy record was broken with the discovery of a small cluster of cases in Auckland.

Those infected hadn't been abroad or recently met someone who has - so Auckland has now been locked down again.

Does that call the viability of the strategy into question for countries that also advocate a zero-covid strategy – like Scotland?

Health Correspondent Deb Cohen reports and Mark Urban is joined from Wellington by Professor Michael Baker who devised New Zealand's Covid strategy and is the architect of the elimination strategy.