Help me with the math here. A "normal" virus that infects every age group equally would require 60-70% herd/vaccination immunity to stop the spread. But what about a virus that is massively biased toward 20% of the population? If we vaccinate around 80% of that 20%, are we done?
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Fair enough. Then the question answers itself. Achieve herd immunity among the old. Now the next question is "how much" herd immunity do you want? As usually understood, the definition is the population-share such that spread is not exponential (not that the spread is zero).
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Exactly why we need to move the conversation from cases to mortality and hospitalizations. For people under 60 this disease is statistically no worse than a flu. And yes I know younger people can die. It's just rare.
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