What the #DeltaVariant means for Australia's attempt to control the #COVID19 pandemic. For Australia & other nations pursuing a #CovidZero approach, including New Zealand, the country's #COVID19 outbreak bears a warning: absent blanket vaccinations, the fortress cannot hold without ever more painful restrictions. Three days after the emergence of a rare Covid-19 case in Sydney, around 40 friends gathered for a birthday party. Along with cake and laughter, there was a hidden t