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lockdown and that triggered angry riots. but the worst is sydney, sydney and new south wailles reporting 291 new locally transmitted cases. so how did it come to this especially in a country that has been hailed as a pandemic success story? from the chair of epidemiology at deacon university in melbourne the methods we used so successfully to keep returning to covid zero in ace trail i can t while we were trying to roll out our vaccine program have now been defeated by this delta variant. it just moves too quickly for that normal test trace isolated approach to be effective. even with the lockdowns in place, we re still seeing the d case numbers roll on because we can t get ahead of the virus. reporter: disease experts say there are two factors driving

Success storyEpidemiology at deacon universityDelta variantVaccine programMace trailCase numbersDisease expertsThe d