New Zealand conceded its ambitious “Covid zero” elimination strategy may no longer be viable Sunday, as an outbreak of the virulent Delta variant continued to spread. Covid-19 Response Minister Chris Hipkins reported a further 21 cases in a virus cluster that emerged in Auckland last week, ending a six-month run of no local cases and sparking a national lockdown. Hipkins said Delta’s highly transmissible nature was making this outbreak more difficult to contain than others, […]