Zero-covid countries need to adapt as delta variant surges

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A man crosses an empty street during lockdown in Sydney, Australia

A man crosses an empty street during lockdown in Sydney, Australia

Steven Saphore/Anadolu Agency via Getty Images

Three countries that were leading the world in the fight against covid-19 now appear to be losing control, with cases rising in Australia, Japan and South Korea.

Their new waves are being caused by a combination of the delta variant, lapses in vigilance and low rates of vaccination, say experts, but do not fundamentally change what we know about how to get the virus under control.

Australia, Japan and South Korea were recently praised for their covid-19 control strategies, ranked …

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