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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If stopping the spread is the goal, then it is an interesting math problem. Need to know the relative rates of transmissions in the various demographic subgroups. But I am with you that the goal should be to vaccinate the high risk groups to reach practical herd immunity.
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By vaccinating the most susceptible group first you reduce the problem by > 90% in size, even if it's only the 20% you vaccinate first.
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