need to balance the measures of virus impact on life, social and economic cost. This is called mitigation. Why didn't you think and ask a question that how long our current measure can sustain? Obviously the current shutdown and lockdown measures are not sustainable indefinitely. So let me ask you, how long these shutdown and lockown will last is acceptable to you? I think a rational mind should tackle both your question and my question at same time.
BTW Italy nationwide lockdown has been enforced for 20 days. It hasn't worked by now.
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